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Regeneration (biology) - Wikipedia

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<span class="minerva-icon minerva-icon--star"></span> <span>Watch</span> </a> </li> <li id="page-actions-edit" class="page-actions-menu__list-item"> <a role="button" id="ca-edit" href="/w/index.php?title=Regeneration_(biology)&amp;action=edit" data-event-name="menu.edit" data-mw="interface" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet edit-page menu__item--page-actions-edit"> <span class="minerva-icon minerva-icon--edit"></span> <span>Edit</span> </a> </li> </ul> </nav> <!-- version 1.0.2 (change every time you update a partial) --> <div id="mw-content-subtitle"><span class="mw-redirectedfrom">(Redirected from <a href="/w/index.php?title=Tissue_regeneration&amp;redirect=no" class="mw-redirect" title="Tissue regeneration">Tissue regeneration</a>)</span></div> </div> <div id="bodyContent" class="content"> <div id="mw-content-text" class="mw-body-content"><script>function mfTempOpenSection(id){var block=document.getElementById("mf-section-"+id);block.className+=" open-block";block.previousSibling.className+=" open-block";}</script><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><section class="mf-section-0" id="mf-section-0"> <p><b>Regeneration</b> in <a href="/wiki/Biology" title="Biology">biology</a> is the process of renewal, restoration, and tissue growth that makes <a href="/wiki/Genome" title="Genome">genomes</a>, <a href="/wiki/Cell_(biology)" title="Cell (biology)">cells</a>, <a href="/wiki/Organisms" class="mw-redirect" title="Organisms">organisms</a>, and <a href="/wiki/Ecosystems" class="mw-redirect" title="Ecosystems">ecosystems</a> <a href="/wiki/Resilience_(ecology)" class="mw-redirect" title="Resilience (ecology)">resilient</a> to natural fluctuations or events that cause disturbance or damage.<sup id="cite_ref-Birbrair_2298–2314_1-0" class="reference"><a href="#cite_note-Birbrair_2298%E2%80%932314-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> Every <a href="/wiki/Species" title="Species">species</a> is capable of regeneration, from <a href="/wiki/Bacteria" title="Bacteria">bacteria</a> to humans.<sup id="cite_ref-Carlson07_2-0" class="reference"><a href="#cite_note-Carlson07-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Gabor_3-0" class="reference"><a href="#cite_note-Gabor-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> Regeneration can either be complete<sup id="cite_ref-CompleteRegen_5-0" class="reference"><a href="#cite_note-CompleteRegen-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> where the new tissue is the same as the lost tissue,<sup id="cite_ref-CompleteRegen_5-1" class="reference"><a href="#cite_note-CompleteRegen-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> or incomplete<sup id="cite_ref-InCompleteRegen_6-0" class="reference"><a href="#cite_note-InCompleteRegen-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> after which the necrotic tissue becomes <a href="/wiki/Fibrosis" title="Fibrosis">fibrotic</a>.<sup id="cite_ref-InCompleteRegen_6-1" class="reference"><a href="#cite_note-InCompleteRegen-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> </p><figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Sea_star_regenerating_legs.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Sea_star_regenerating_legs.jpg/280px-Sea_star_regenerating_legs.jpg" decoding="async" width="280" height="231" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Sea_star_regenerating_legs.jpg/420px-Sea_star_regenerating_legs.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Sea_star_regenerating_legs.jpg/560px-Sea_star_regenerating_legs.jpg 2x" data-file-width="1274" data-file-height="1050"></a><figcaption>Sunflower <a href="/wiki/Starfish" title="Starfish">sea star</a> regenerates its arms.</figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Dwarf_Yellow-headed_gecko_edit.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/f/fe/Dwarf_Yellow-headed_gecko_edit.jpg/280px-Dwarf_Yellow-headed_gecko_edit.jpg" decoding="async" width="280" height="187" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/fe/Dwarf_Yellow-headed_gecko_edit.jpg/420px-Dwarf_Yellow-headed_gecko_edit.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/fe/Dwarf_Yellow-headed_gecko_edit.jpg/560px-Dwarf_Yellow-headed_gecko_edit.jpg 2x" data-file-width="1600" data-file-height="1067"></a><figcaption><a href="/wiki/Dwarf_yellow-headed_gecko" title="Dwarf yellow-headed gecko">Dwarf yellow-headed gecko</a> with regenerating tail</figcaption></figure> <p>At its most elementary level, regeneration is mediated by the molecular processes of <a href="/wiki/Gene_regulation" class="mw-redirect" title="Gene regulation">gene regulation</a> and involves the cellular processes of <a href="/wiki/Cell_proliferation" title="Cell proliferation">cell proliferation</a>, <a href="/wiki/Morphogenesis" title="Morphogenesis">morphogenesis</a> and <a href="/wiki/Cell_differentiation" class="mw-redirect" title="Cell differentiation">cell differentiation</a>.<sup id="cite_ref-Himeno92_7-0" class="reference"><a href="#cite_note-Himeno92-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Bryant88_8-0" class="reference"><a href="#cite_note-Bryant88-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> Regeneration in biology, however, mainly refers to the <a href="/wiki/Morphogenesis" title="Morphogenesis">morphogenic</a> processes that characterize the <a href="/wiki/Phenotypic_plasticity" title="Phenotypic plasticity">phenotypic plasticity</a> of <a href="/wiki/Phenotypic_trait" title="Phenotypic trait">traits</a> allowing multi-cellular organisms to repair and maintain the integrity of their physiological and morphological states. Above the genetic level, regeneration is fundamentally regulated by asexual cellular processes.<sup id="cite_ref-Brokes08_9-0" class="reference"><a href="#cite_note-Brokes08-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> Regeneration is different from reproduction. For example, <a href="/wiki/Hydra_(genus)" title="Hydra (genus)">hydra</a> perform regeneration but reproduce by the method of <a href="/wiki/Budding" title="Budding">budding</a>. </p><p>The regenerative process occurs in two multi-step phases: the preparation phase and the redevelopment phase.<sup id="cite_ref-onlinelibrary.wiley.com_10-0" class="reference"><a href="#cite_note-onlinelibrary.wiley.com-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> Regeneration begins with an amputation which triggers the first phase. Right after the amputation, migrating <a href="/wiki/Epidermis" title="Epidermis">epidermal</a> cells form a wound epithelium which thickens, through cell division, throughout the first phase to form a cap around the site of the wound.<sup id="cite_ref-onlinelibrary.wiley.com_10-1" class="reference"><a href="#cite_note-onlinelibrary.wiley.com-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> The cells underneath this cap then begin to rapidly divide and form a cone shaped end to the amputation known as a blastema. Included in the blastema are skin, muscle, and cartilage cells that de-differentiate and become similar to stem cells in that they can become multiple types of cells. <a href="/wiki/Cell_differentiation" class="mw-redirect" title="Cell differentiation">Cells differentiate</a> to the same purpose they originally filled meaning <a href="/wiki/Skin_cells" class="mw-redirect" title="Skin cells">skin cells</a> again become skin cells and muscle cells become muscles. These de-differentiated cells divide until enough cells are available at which point they differentiate again and the shape of the blastema begins to flatten out. It is at this point that the second phase begins, the redevelopment of the limb. In this stage, genes signal to the cells to differentiate themselves and the various parts of the limb are developed. The end result is a limb that looks and operates identically to the one that was lost, usually without any visual indication that the limb is newly generated. </p><p>The hydra and the <a href="/wiki/Planarian" title="Planarian">planarian</a> flatworm have long served as model organisms for their highly <a href="/wiki/Adaptation" title="Adaptation">adaptive</a> regenerative capabilities.<sup id="cite_ref-Sánchez00_12-0" class="reference"><a href="#cite_note-S%C3%A1nchez00-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> Once wounded, their cells become activated and restore the organs back to their pre-existing state.<sup id="cite_ref-Reddien04_13-0" class="reference"><a href="#cite_note-Reddien04-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> The <a href="/wiki/Caudata" title="Caudata">Caudata</a> ("urodeles"; <a href="/wiki/Salamander" title="Salamander">salamanders</a> and <a href="/wiki/Newt" title="Newt">newts</a>), an <a href="/wiki/Order_(biology)" title="Order (biology)">order</a> of tailed <a href="/wiki/Amphibia" class="mw-redirect" title="Amphibia">amphibians</a>, is possibly the most adept <a href="/wiki/Vertebrate" title="Vertebrate">vertebrate</a> group at regeneration, given their capability of regenerating limbs, tails, jaws, eyes and a variety of internal structures.<sup id="cite_ref-Carlson07_2-1" class="reference"><a href="#cite_note-Carlson07-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> The regeneration of organs is a common and widespread adaptive capability among <a href="/wiki/Metazoa" class="mw-redirect" title="Metazoa">metazoan</a> creatures.<sup id="cite_ref-Sánchez00_12-1" class="reference"><a href="#cite_note-S%C3%A1nchez00-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> In a related context, some animals are able to reproduce <a href="/wiki/Asexual_reproduction" title="Asexual reproduction">asexually</a> through <a href="/wiki/Fragmentation_(reproduction)" title="Fragmentation (reproduction)">fragmentation</a>, budding, or <a href="/wiki/Fission_(biology)" title="Fission (biology)">fission</a>.<sup id="cite_ref-Brokes08_9-1" class="reference"><a href="#cite_note-Brokes08-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> A planarian parent, for example, will constrict, split in the middle, and each half generates a new end to form two <a href="/wiki/Clone_(cell_biology)" title="Clone (cell biology)">clones</a> of the original.<sup id="cite_ref-Campbell_1996_14-0" class="reference"><a href="#cite_note-Campbell_1996-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> </p><p><a href="/wiki/Echinoderms" class="mw-redirect" title="Echinoderms">Echinoderms</a> (such as the sea star), crayfish, many reptiles, and amphibians exhibit remarkable examples of tissue regeneration. The case of <a href="/wiki/Autotomy" title="Autotomy">autotomy</a>, for example, serves as a defensive function as the animal detaches a limb or tail to avoid capture. After the limb or tail has been autotomized, cells move into action and the tissues will regenerate.<sup id="cite_ref-Wilkie01_15-0" class="reference"><a href="#cite_note-Wilkie01-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Maiorana77_16-0" class="reference"><a href="#cite_note-Maiorana77-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Maginnis06_17-0" class="reference"><a href="#cite_note-Maginnis06-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup> In some cases a shed limb can itself regenerate a new individual.<sup id="cite_ref-Edmondson1935_18-0" class="reference"><a href="#cite_note-Edmondson1935-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> Limited regeneration of limbs occurs in most fishes and salamanders, and tail regeneration takes place in larval frogs and toads (but not adults). The whole limb of a salamander or a triton will grow repeatedly after amputation. In reptiles, chelonians, crocodilians and snakes are unable to regenerate lost parts, but many (not all) kinds of lizards, geckos and iguanas possess regeneration capacity in a high degree. Usually, it involves dropping a section of their tail and regenerating it as part of a defense mechanism. While escaping a predator, if the predator catches the tail, it will disconnect.<sup id="cite_ref-UCSB_Science_Line_19-0" class="reference"><a href="#cite_note-UCSB_Science_Line-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> </p> <div id="toc" class="toc" role="navigation" aria-labelledby="mw-toc-heading"><input type="checkbox" role="button" id="toctogglecheckbox" class="toctogglecheckbox" style="display:none"><div class="toctitle" lang="en" dir="ltr"><h2 id="mw-toc-heading">Contents</h2><span class="toctogglespan"><label class="toctogglelabel" for="toctogglecheckbox"></label></span></div> <ul> <li class="toclevel-1 tocsection-1"><a href="#Ecosystems"><span class="tocnumber">1</span> <span class="toctext">Ecosystems</span></a></li> <li class="toclevel-1 tocsection-2"><a href="#Cellular_molecular_fundamentals"><span class="tocnumber">2</span> <span class="toctext">Cellular molecular fundamentals</span></a></li> <li class="toclevel-1 tocsection-3"><a href="#Tissues"><span class="tocnumber">3</span> <span class="toctext">Tissues</span></a></li> <li class="toclevel-1 tocsection-4"><a href="#In_animals"><span class="tocnumber">4</span> <span class="toctext">In animals</span></a> <ul> <li class="toclevel-2 tocsection-5"><a href="#Arthropods"><span class="tocnumber">4.1</span> <span class="toctext">Arthropods</span></a> <ul> <li class="toclevel-3 tocsection-6"><a href="#Limb_regeneration"><span class="tocnumber">4.1.1</span> <span class="toctext">Limb regeneration</span></a></li> <li class="toclevel-3 tocsection-7"><a href="#Venom_regeneration"><span class="tocnumber">4.1.2</span> <span class="toctext">Venom regeneration</span></a></li> <li class="toclevel-3 tocsection-8"><a href="#Fruit_fly_model"><span class="tocnumber">4.1.3</span> <span class="toctext">Fruit fly model</span></a></li> </ul> </li> <li class="toclevel-2 tocsection-9"><a href="#Annelids"><span class="tocnumber">4.2</span> <span class="toctext">Annelids</span></a></li> <li class="toclevel-2 tocsection-10"><a href="#Echinoderms"><span class="tocnumber">4.3</span> <span class="toctext">Echinoderms</span></a></li> <li class="toclevel-2 tocsection-11"><a href="#Planaria_(Platyhelminthes)"><span class="tocnumber">4.4</span> <span class="toctext">Planaria (Platyhelminthes)</span></a></li> <li class="toclevel-2 tocsection-12"><a href="#Amphibians"><span class="tocnumber">4.5</span> <span class="toctext">Amphibians</span></a> <ul> <li class="toclevel-3 tocsection-13"><a href="#Frog_model"><span class="tocnumber">4.5.1</span> <span class="toctext">Frog model</span></a></li> </ul> </li> <li class="toclevel-2 tocsection-14"><a href="#Hydra"><span class="tocnumber">4.6</span> <span class="toctext">Hydra</span></a></li> <li class="toclevel-2 tocsection-15"><a href="#Aves_(birds)"><span class="tocnumber">4.7</span> <span class="toctext">Aves (birds)</span></a></li> <li class="toclevel-2 tocsection-16"><a href="#Mammals"><span class="tocnumber">4.8</span> <span class="toctext">Mammals</span></a> <ul> <li class="toclevel-3 tocsection-17"><a href="#Humans"><span class="tocnumber">4.8.1</span> <span class="toctext">Humans</span></a></li> </ul> </li> <li class="toclevel-2 tocsection-18"><a href="#Reptiles"><span class="tocnumber">4.9</span> <span class="toctext">Reptiles</span></a></li> <li class="toclevel-2 tocsection-19"><a href="#Chondrichthyes"><span class="tocnumber">4.10</span> <span class="toctext">Chondrichthyes</span></a></li> </ul> </li> <li class="toclevel-1 tocsection-20"><a href="#See_also"><span class="tocnumber">5</span> <span class="toctext">See also</span></a></li> <li class="toclevel-1 tocsection-21"><a href="#Notes"><span class="tocnumber">6</span> <span class="toctext">Notes</span></a></li> <li class="toclevel-1 tocsection-22"><a href="#Sources"><span class="tocnumber">7</span> <span class="toctext">Sources</span></a></li> <li class="toclevel-1 tocsection-23"><a href="#Further_reading"><span class="tocnumber">8</span> <span class="toctext">Further reading</span></a></li> <li class="toclevel-1 tocsection-24"><a href="#External_links"><span class="tocnumber">9</span> <span class="toctext">External links</span></a></li> </ul> </div> </section><div class="mw-heading mw-heading2 section-heading" onclick="mfTempOpenSection(1)"><span class="indicator mf-icon mf-icon-expand mf-icon--small"></span><h2 id="Ecosystems">Ecosystems</h2><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Regeneration_(biology)&amp;action=edit&amp;section=1" title="Edit section: Ecosystems" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div><section class="mf-section-1 collapsible-block" id="mf-section-1"> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Regeneration_(ecology)" title="Regeneration (ecology)">Regeneration (ecology)</a></div> <p>Ecosystems can be regenerative. Following a disturbance, such as a fire or pest outbreak in a forest, <a href="/wiki/Pioneer_species" title="Pioneer species">pioneering species</a> will occupy, compete for space, and establish themselves in the newly opened habitat. The new growth of seedlings and <a href="/wiki/Assembly_rules" title="Assembly rules">community assembly</a> process is known as regeneration in <a href="/wiki/Ecology" title="Ecology">ecology</a>.<sup id="cite_ref-Diet_ze08_20-0" class="reference"><a href="#cite_note-Diet_ze08-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Bailey02_21-0" class="reference"><a href="#cite_note-Bailey02-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup> </p> </section><div class="mw-heading mw-heading2 section-heading" onclick="mfTempOpenSection(2)"><span class="indicator mf-icon mf-icon-expand mf-icon--small"></span><h2 id="Cellular_molecular_fundamentals">Cellular molecular fundamentals</h2><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Regeneration_(biology)&amp;action=edit&amp;section=2" title="Edit section: Cellular molecular fundamentals" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div><section class="mf-section-2 collapsible-block" id="mf-section-2"> <p>Pattern formation in the morphogenesis of an animal is regulated by <a href="/wiki/Regulation_of_gene_expression" title="Regulation of gene expression">genetic induction factors</a> that put cells to work after damage has occurred. Neural cells, for example, express growth-associated proteins, such as <a href="/wiki/GAP-43" class="mw-redirect" title="GAP-43">GAP-43</a>, <a href="/wiki/Tubulin" title="Tubulin">tubulin</a>, <a href="/wiki/Actin" title="Actin">actin</a>, an array of novel <a href="/wiki/Neuropeptide" title="Neuropeptide">neuropeptides</a>, and <a href="/wiki/Cytokines" class="mw-redirect" title="Cytokines">cytokines</a> that induce a cellular physiological response to regenerate from the damage.<sup id="cite_ref-Fu97_22-0" class="reference"><a href="#cite_note-Fu97-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup> Many of the genes that are involved in the original development of tissues are reinitialized during the regenerative process. Cells in the <a href="/wiki/Primordium" title="Primordium">primordia</a> of <a href="/wiki/Zebrafish" title="Zebrafish">zebrafish</a> fins, for example, express four genes from the <a href="/wiki/Homeobox" title="Homeobox">homeobox</a> <i>msx</i> family during development and regeneration.<sup id="cite_ref-akimenko96_23-0" class="reference"><a href="#cite_note-akimenko96-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup> </p> </section><div class="mw-heading mw-heading2 section-heading" onclick="mfTempOpenSection(3)"><span class="indicator mf-icon mf-icon-expand mf-icon--small"></span><h2 id="Tissues">Tissues</h2><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Regeneration_(biology)&amp;action=edit&amp;section=3" title="Edit section: Tissues" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div><section class="mf-section-3 collapsible-block" id="mf-section-3"> <p>"Strategies include the rearrangement of pre-existing tissue, the use of adult <a href="/wiki/Somatic_cell" title="Somatic cell">somatic</a> <a href="/wiki/Stem_cells" class="mw-redirect" title="Stem cells">stem cells</a> and the dedifferentiation and/or transdifferentiation of cells, and more than one mode can operate in different tissues of the same animal.<sup id="cite_ref-Birbrair_2298–2314_1-1" class="reference"><a href="#cite_note-Birbrair_2298%E2%80%932314-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> All these strategies result in the re-establishment of appropriate tissue polarity, structure and form."<sup id="cite_ref-Alvarado06_24-0" class="reference"><a href="#cite_note-Alvarado06-24"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: 873">: 873 </span></sup> During the developmental process, genes are activated that serve to modify the properties of <a href="/wiki/Cell_potency" title="Cell potency">cell</a> as they differentiate into different tissues. Development and regeneration involves the coordination and organization of populations cells into a <a href="/wiki/Blastema" title="Blastema">blastema</a>, which is "a mound of stem cells from which regeneration begins".<sup id="cite_ref-Kumar07_25-0" class="reference"><a href="#cite_note-Kumar07-25"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup> Dedifferentiation of cells means that they lose their tissue-specific characteristics as tissues remodel during the regeneration process. This should not be confused with the transdifferentiation of cells which is when they lose their tissue-specific characteristics during the regeneration process, and then re-differentiate to a different kind of cell.<sup id="cite_ref-Alvarado06_24-1" class="reference"><a href="#cite_note-Alvarado06-24"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup> </p> </section><div class="mw-heading mw-heading2 section-heading" onclick="mfTempOpenSection(4)"><span class="indicator mf-icon mf-icon-expand mf-icon--small"></span><h2 id="In_animals">In animals</h2><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Regeneration_(biology)&amp;action=edit&amp;section=4" title="Edit section: In animals" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div><section class="mf-section-4 collapsible-block" id="mf-section-4"> <div class="mw-heading mw-heading3"><h3 id="Arthropods">Arthropods</h3><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Regeneration_(biology)&amp;action=edit&amp;section=5" title="Edit section: Arthropods" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <div class="mw-heading mw-heading4"><h4 id="Limb_regeneration">Limb regeneration</h4><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Regeneration_(biology)&amp;action=edit&amp;section=6" title="Edit section: Limb regeneration" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <p>Many <a href="/wiki/Arthropod" title="Arthropod">arthropods</a> can regenerate limbs and other appendages following either injury or <a href="/wiki/Autotomy" title="Autotomy">autotomy</a>.<sup id="cite_ref-Skinner_1985_26-0" class="reference"><a href="#cite_note-Skinner_1985-26"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup> Regeneration capacity is constrained by the developmental stage and ability to molt. </p><p><a href="/wiki/Crustacean" title="Crustacean">Crustaceans</a>, which continually molt, can regenerate throughout their lifetimes.<sup id="cite_ref-Seifert_AW_2012_27-0" class="reference"><a href="#cite_note-Seifert_AW_2012-27"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup> While molting cycles are generally hormonally regulated, limb amputation induces premature molting.<sup id="cite_ref-Skinner_1985_26-1" class="reference"><a href="#cite_note-Skinner_1985-26"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Travis_1955_28-0" class="reference"><a href="#cite_note-Travis_1955-28"><span class="cite-bracket">[</span>28<span class="cite-bracket">]</span></a></sup> </p><p><a href="/wiki/Hemimetabolism" title="Hemimetabolism">Hemimetabolous</a> <a href="/wiki/Insect" title="Insect">insects</a> such as crickets can regenerate limbs as nymphs, before their final <a href="/wiki/Moulting" title="Moulting">molt.</a><sup id="cite_ref-29" class="reference"><a href="#cite_note-29"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup> </p><p><a href="/wiki/Holometabolism" title="Holometabolism">Holometabolous</a> insects can regenerate appendages as larvae prior to the final molt and <a href="/wiki/Holometabolism" title="Holometabolism">metamorphosis</a>. Beetle larvae, for example, can regenerate amputated limbs. Fruit fly larvae do not have limbs but can regenerate their appendage primordia, <a href="/wiki/Imaginal_disc" title="Imaginal disc">imaginal discs</a>.<sup id="cite_ref-:0_30-0" class="reference"><a href="#cite_note-:0-30"><span class="cite-bracket">[</span>30<span class="cite-bracket">]</span></a></sup> In both systems, the regrowth of the new tissue delays pupation.<sup id="cite_ref-:0_30-1" class="reference"><a href="#cite_note-:0-30"><span class="cite-bracket">[</span>30<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-31" class="reference"><a href="#cite_note-31"><span class="cite-bracket">[</span>31<span class="cite-bracket">]</span></a></sup> </p><p>Mechanisms underlying appendage limb regeneration in insects and crustaceans are highly conserved.<sup id="cite_ref-32" class="reference"><a href="#cite_note-32"><span class="cite-bracket">[</span>32<span class="cite-bracket">]</span></a></sup> During limb regeneration species in both taxa form a <a href="/wiki/Blastema" title="Blastema">blastema</a> that proliferates and grows to repattern the missing tissue.<sup id="cite_ref-33" class="reference"><a href="#cite_note-33"><span class="cite-bracket">[</span>33<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading4"><h4 id="Venom_regeneration">Venom regeneration</h4><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Regeneration_(biology)&amp;action=edit&amp;section=7" title="Edit section: Venom regeneration" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <p><a href="/wiki/Arachnid" title="Arachnid">Arachnids</a>, including scorpions, are known to regenerate their venom, although the content of the regenerated venom is different from the original venom during its regeneration, as the venom volume is replaced before the active proteins are all replenished.<sup id="cite_ref-34" class="reference"><a href="#cite_note-34"><span class="cite-bracket">[</span>34<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading4"><h4 id="Fruit_fly_model">Fruit fly model</h4><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Regeneration_(biology)&amp;action=edit&amp;section=8" title="Edit section: Fruit fly model" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <p>The fruit fly <a href="/wiki/Drosophila_melanogaster" title="Drosophila melanogaster">Drosophila melanogaster</a> is a useful model organism to understand the molecular mechanisms that control regeneration, especially gut and germline regeneration.<sup id="cite_ref-:0_30-2" class="reference"><a href="#cite_note-:0-30"><span class="cite-bracket">[</span>30<span class="cite-bracket">]</span></a></sup> In these tissues, resident stem cells continually renew lost cells.<sup id="cite_ref-:0_30-3" class="reference"><a href="#cite_note-:0-30"><span class="cite-bracket">[</span>30<span class="cite-bracket">]</span></a></sup> The <a href="/wiki/Hippo_signaling_pathway" title="Hippo signaling pathway">Hippo signaling pathway</a> was discovered in flies and was found to be required for midgut regeneration. Later, this conserved signaling pathway was also found to be essential for regeneration of many mammalian tissues, including heart, liver, skin, and lung, and intestine.<sup id="cite_ref-35" class="reference"><a href="#cite_note-35"><span class="cite-bracket">[</span>35<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Annelids">Annelids</h3><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Regeneration_(biology)&amp;action=edit&amp;section=9" title="Edit section: Annelids" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <p>Many <a href="/wiki/Annelid" title="Annelid">annelids</a> (segmented worms) are capable of regeneration.<sup id="cite_ref-Bely2006_36-0" class="reference"><a href="#cite_note-Bely2006-36"><span class="cite-bracket">[</span>36<span class="cite-bracket">]</span></a></sup> For example, <i><a href="/wiki/Chaetopterus_variopedatus" title="Chaetopterus variopedatus">Chaetopterus variopedatus</a></i> and <i><a href="/w/index.php?title=Branchiomma_nigromaculata&amp;action=edit&amp;redlink=1" class="new" title="Branchiomma nigromaculata (page does not exist)">Branchiomma nigromaculata</a></i> can regenerate both anterior and posterior body parts after latitudinal bisection.<sup id="cite_ref-Hill1972_37-0" class="reference"><a href="#cite_note-Hill1972-37"><span class="cite-bracket">[</span>37<span class="cite-bracket">]</span></a></sup> The relationship between <a href="/wiki/Somatic_cell" title="Somatic cell">somatic</a> and <a href="/wiki/Germline" title="Germline">germline</a> stem cell regeneration has been studied at the molecular level in the annelid <i><a href="/wiki/Capitella_teleta" title="Capitella teleta">Capitella teleta</a></i>.<sup id="cite_ref-Giani2011_38-0" class="reference"><a href="#cite_note-Giani2011-38"><span class="cite-bracket">[</span>38<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Leeches" class="mw-redirect" title="Leeches">Leeches</a>, however, appear incapable of segmental regeneration.<sup id="cite_ref-Zoran_39-0" class="reference"><a href="#cite_note-Zoran-39"><span class="cite-bracket">[</span>39<span class="cite-bracket">]</span></a></sup> Furthermore, their close relatives, the <a href="/wiki/Branchiobdellida" title="Branchiobdellida">branchiobdellids</a>, are also incapable of segmental regeneration.<sup id="cite_ref-Zoran_39-1" class="reference"><a href="#cite_note-Zoran-39"><span class="cite-bracket">[</span>39<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Bely2006_36-1" class="reference"><a href="#cite_note-Bely2006-36"><span class="cite-bracket">[</span>36<span class="cite-bracket">]</span></a></sup> However, certain individuals, like the lumbriculids, can regenerate from only a few segments.<sup id="cite_ref-Zoran_39-2" class="reference"><a href="#cite_note-Zoran-39"><span class="cite-bracket">[</span>39<span class="cite-bracket">]</span></a></sup> Segmental regeneration in these animals is epimorphic and occurs through <a href="/wiki/Blastema" title="Blastema">blastema</a> formation.<sup id="cite_ref-Zoran_39-3" class="reference"><a href="#cite_note-Zoran-39"><span class="cite-bracket">[</span>39<span class="cite-bracket">]</span></a></sup> Segmental regeneration has been gained and lost during annelid evolution, as seen in <a href="/wiki/Oligochaetes" class="mw-redirect" title="Oligochaetes">oligochaetes</a>, where head regeneration has been lost three separate times.<sup id="cite_ref-Zoran_39-4" class="reference"><a href="#cite_note-Zoran-39"><span class="cite-bracket">[</span>39<span class="cite-bracket">]</span></a></sup> </p><p>Along with epimorphosis, some <a href="/wiki/Polychaetes" class="mw-redirect" title="Polychaetes">polychaetes</a> like <i><a href="/wiki/Sabella_pavonina" title="Sabella pavonina">Sabella pavonina</a></i> experience morphallactic regeneration.<sup id="cite_ref-Zoran_39-5" class="reference"><a href="#cite_note-Zoran-39"><span class="cite-bracket">[</span>39<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-40" class="reference"><a href="#cite_note-40"><span class="cite-bracket">[</span>40<span class="cite-bracket">]</span></a></sup> Morphallaxis involves the de-differentiation, transformation, and re-differentation of cells to regenerate tissues. How prominent morphallactic regeneration is in <a href="/wiki/Oligochaetes" class="mw-redirect" title="Oligochaetes">oligochaetes</a> is currently not well understood. Although relatively under-reported, it is possible that morphallaxis is a common mode of inter-segment regeneration in annelids. Following regeneration in <i>L. variegatus</i>, past posterior segments sometimes become anterior in the new body orientation, consistent with morphallaxis. </p><p>Following amputation, most annelids are capable of sealing their body via rapid muscular contraction. Constriction of body muscle can lead to infection prevention. In certain species, such as <i><a href="/wiki/Limnodrilus" title="Limnodrilus">Limnodrilus</a></i>, <a href="/wiki/Autolysis_(biology)" title="Autolysis (biology)">autolysis</a> can be seen within hours after amputation in the <a href="/wiki/Ectoderm" title="Ectoderm">ectoderm</a> and <a href="/wiki/Mesoderm" title="Mesoderm">mesoderm</a>. Amputation is also thought to cause a large migration of cells to the injury site, and these form a wound plug. </p> <div class="mw-heading mw-heading3"><h3 id="Echinoderms">Echinoderms</h3><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Regeneration_(biology)&amp;action=edit&amp;section=10" title="Edit section: Echinoderms" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <p>Tissue regeneration is widespread among echinoderms and has been well documented in <a href="/wiki/Starfish" title="Starfish">starfish</a> <i>(Asteroidea)</i>, <a href="/wiki/Sea_cucumber" title="Sea cucumber">sea cucumbers</a> <i>(Holothuroidea)</i>, and <a href="/wiki/Sea_urchin" title="Sea urchin">sea urchins</a> <i>(Echinoidea).</i> Appendage regeneration in echinoderms has been studied since at least the 19th century.<sup id="cite_ref-41" class="reference"><a href="#cite_note-41"><span class="cite-bracket">[</span>41<span class="cite-bracket">]</span></a></sup> In addition to appendages, some species can regenerate internal organs and parts of their central nervous system.<sup id="cite_ref-42" class="reference"><a href="#cite_note-42"><span class="cite-bracket">[</span>42<span class="cite-bracket">]</span></a></sup> In response to injury starfish can autotomize damaged appendages. Autotomy is the self-amputation of a body part, usually an appendage.  Depending on severity, starfish will then go through a four-week process where the appendage will be regenerated.<sup id="cite_ref-43" class="reference"><a href="#cite_note-43"><span class="cite-bracket">[</span>43<span class="cite-bracket">]</span></a></sup> Some species must retain mouth cells to regenerate an appendage, due to the need for energy.<sup id="cite_ref-Morgan_1900_44-0" class="reference"><a href="#cite_note-Morgan_1900-44"><span class="cite-bracket">[</span>44<span class="cite-bracket">]</span></a></sup> The first organs to regenerate, in all species documented to date, are associated with the digestive tract. Thus, most knowledge about visceral regeneration in holothurians concerns this system.<sup id="cite_ref-45" class="reference"><a href="#cite_note-45"><span class="cite-bracket">[</span>45<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Planaria_(Platyhelminthes)"><span id="Planaria_.28Platyhelminthes.29"></span>Planaria (Platyhelminthes)</h3><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Regeneration_(biology)&amp;action=edit&amp;section=11" title="Edit section: Planaria (Platyhelminthes)" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <p>Regeneration research using <a href="/wiki/Planarian" title="Planarian">Planarians</a> began in the late 1800s and was popularized by T.H. Morgan at the beginning of the 20th century.<sup id="cite_ref-Morgan_1900_44-1" class="reference"><a href="#cite_note-Morgan_1900-44"><span class="cite-bracket">[</span>44<span class="cite-bracket">]</span></a></sup> Alejandro Sanchez-Alvarado and Philip Newmark transformed planarians into a model genetic organism in the beginning of the 20th century to study the molecular mechanisms underlying regeneration in these animals.<sup id="cite_ref-46" class="reference"><a href="#cite_note-46"><span class="cite-bracket">[</span>46<span class="cite-bracket">]</span></a></sup> Planarians exhibit an extraordinary ability to regenerate lost body parts. For example, a planarian split lengthwise or crosswise will regenerate into two separate individuals. In one experiment, T.H. Morgan found that a piece corresponding to 1/279th of a planarian<sup id="cite_ref-Morgan_1900_44-2" class="reference"><a href="#cite_note-Morgan_1900-44"><span class="cite-bracket">[</span>44<span class="cite-bracket">]</span></a></sup> or a fragment with as few as 10,000 cells can successfully regenerate into a new worm within one to two weeks.<sup id="cite_ref-Montgomery_1974_47-0" class="reference"><a href="#cite_note-Montgomery_1974-47"><span class="cite-bracket">[</span>47<span class="cite-bracket">]</span></a></sup> After amputation, stump cells form a <a href="/wiki/Blastema" title="Blastema">blastema</a> formed from <a href="/wiki/Neoblast" title="Neoblast">neoblasts</a>, pluripotent cells found throughout the planarian body.<sup id="cite_ref-48" class="reference"><a href="#cite_note-48"><span class="cite-bracket">[</span>48<span class="cite-bracket">]</span></a></sup> New tissue grows from neoblasts with neoblasts comprising between 20 and 30% of all planarian cells.<sup id="cite_ref-Montgomery_1974_47-1" class="reference"><a href="#cite_note-Montgomery_1974-47"><span class="cite-bracket">[</span>47<span class="cite-bracket">]</span></a></sup> Recent work has confirmed that neoblasts are totipotent since one single neoblast can regenerate an entire irradiated animal that has been rendered incapable of regeneration.<sup id="cite_ref-49" class="reference"><a href="#cite_note-49"><span class="cite-bracket">[</span>49<span class="cite-bracket">]</span></a></sup> In order to prevent starvation a planarian will use their own cells for energy, this phenomenon is known as de-growth.<sup id="cite_ref-Reddien04_13-1" class="reference"><a href="#cite_note-Reddien04-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Amphibians">Amphibians</h3><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Regeneration_(biology)&amp;action=edit&amp;section=12" title="Edit section: Amphibians" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <p>Limb regeneration in the <a href="/wiki/Axolotl" title="Axolotl">axolotl</a> and <a href="/wiki/Newt" title="Newt">newt</a> has been extensively studied and researched. The nineteenth century studies of this subject are reviewed in Holland (2021).<sup id="cite_ref-Holland_50-0" class="reference"><a href="#cite_note-Holland-50"><span class="cite-bracket">[</span>50<span class="cite-bracket">]</span></a></sup> Urodele amphibians, such as salamanders and newts, display the highest regenerative ability among tetrapods.<sup id="cite_ref-Brockes_2001_51-0" class="reference"><a href="#cite_note-Brockes_2001-51"><span class="cite-bracket">[</span>51<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Holland_50-1" class="reference"><a href="#cite_note-Holland-50"><span class="cite-bracket">[</span>50<span class="cite-bracket">]</span></a></sup> As such, they can fully regenerate their limbs, tail, jaws, and retina via epimorphic regeneration leading to functional replacement with new tissue.<sup id="cite_ref-Brockes_2002_52-0" class="reference"><a href="#cite_note-Brockes_2002-52"><span class="cite-bracket">[</span>52<span class="cite-bracket">]</span></a></sup> Salamander limb regeneration occurs in two main steps. First, the local cells dedifferentiate at the wound site into progenitor to form a <a href="/wiki/Blastema" title="Blastema">blastema</a>.<sup id="cite_ref-Iten_1973_53-0" class="reference"><a href="#cite_note-Iten_1973-53"><span class="cite-bracket">[</span>53<span class="cite-bracket">]</span></a></sup> Second, the blastemal cells will undergo <a href="/wiki/Cell_proliferation" title="Cell proliferation">cell proliferation</a>, patterning, <a href="/wiki/Cell_differentiation" class="mw-redirect" title="Cell differentiation">cell differentiation</a> and tissue growth using similar genetic mechanisms that deployed during embryonic development.<sup id="cite_ref-stepwise_54-0" class="reference"><a href="#cite_note-stepwise-54"><span class="cite-bracket">[</span>54<span class="cite-bracket">]</span></a></sup> Ultimately, blastemal cells will generate all the cells for the new structure.<sup id="cite_ref-Brockes_2001_51-1" class="reference"><a href="#cite_note-Brockes_2001-51"><span class="cite-bracket">[</span>51<span class="cite-bracket">]</span></a></sup> </p> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:AxolotlBE.jpg" class="mw-file-description"><noscript><img src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f6/AxolotlBE.jpg/220px-AxolotlBE.jpg" decoding="async" width="220" height="164" class="mw-file-element" data-file-width="480" data-file-height="358"></noscript><span class="lazy-image-placeholder" style="width: 220px;height: 164px;" data-src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f6/AxolotlBE.jpg/220px-AxolotlBE.jpg" data-width="220" data-height="164" data-srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f6/AxolotlBE.jpg/330px-AxolotlBE.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f6/AxolotlBE.jpg/440px-AxolotlBE.jpg 2x" data-class="mw-file-element">&nbsp;</span></a><figcaption><a href="/wiki/Axolotl" title="Axolotl">Axolotls</a> can regenerate a variety of structures, including their limbs.</figcaption></figure> <p>After amputation, the epidermis migrates to cover the stump in 1–2 hours, forming a structure called the wound epithelium (WE).<sup id="cite_ref-55" class="reference"><a href="#cite_note-55"><span class="cite-bracket">[</span>55<span class="cite-bracket">]</span></a></sup> Epidermal cells continue to migrate over the WE, resulting in a thickened, specialized signaling center called the apical epithelial cap (AEC).<sup id="cite_ref-56" class="reference"><a href="#cite_note-56"><span class="cite-bracket">[</span>56<span class="cite-bracket">]</span></a></sup> Over the next several days there are changes in the underlying stump tissues that result in the formation of a <a href="/wiki/Blastema" title="Blastema">blastema</a> (a mass of dedifferentiated <a href="/wiki/Cell_proliferation" title="Cell proliferation">proliferating</a> cells). As the blastema forms, <a href="/wiki/Hox_genes_in_amphibians_and_reptiles" title="Hox genes in amphibians and reptiles">pattern formation genes</a> – such as <a href="/wiki/Homeobox" title="Homeobox">Hox</a>A and HoxD – are activated as they were when the limb was formed in the <a href="/wiki/Embryo" title="Embryo">embryo</a>.<sup id="cite_ref-bryant_57-0" class="reference"><a href="#cite_note-bryant-57"><span class="cite-bracket">[</span>57<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-58" class="reference"><a href="#cite_note-58"><span class="cite-bracket">[</span>58<span class="cite-bracket">]</span></a></sup> The positional identity of the <a href="/wiki/Anatomical_terms_of_location" title="Anatomical terms of location">distal</a> tip of the limb (i.e. the autopod, which is the hand or foot) is formed first in the blastema. Intermediate positional identities between the stump and the distal tip are then filled in through a process called intercalation.<sup id="cite_ref-bryant_57-1" class="reference"><a href="#cite_note-bryant-57"><span class="cite-bracket">[</span>57<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Motor_neuron" title="Motor neuron">Motor neurons</a>, muscle, and blood vessels grow with the regenerated limb, and reestablish the connections that were present prior to amputation. The time that this entire process takes varies according to the age of the animal, ranging from about a month to around three months in the adult and then the limb becomes fully functional. Researchers at Australian <a href="/wiki/Regenerative_Medicine" class="mw-redirect" title="Regenerative Medicine">Regenerative Medicine</a> Institute at <a href="/wiki/Monash_University" title="Monash University">Monash University</a> have published that when <a href="/wiki/Macrophages" class="mw-redirect" title="Macrophages">macrophages</a>, which eat up material debris,<sup id="cite_ref-macr20130523_59-0" class="reference"><a href="#cite_note-macr20130523-59"><span class="cite-bracket">[</span>59<span class="cite-bracket">]</span></a></sup> were removed, salamanders lost their ability to regenerate and formed scarred tissue instead.<sup id="cite_ref-pmid23690624_60-0" class="reference"><a href="#cite_note-pmid23690624-60"><span class="cite-bracket">[</span>60<span class="cite-bracket">]</span></a></sup> The axolotl salamander <i><a href="/wiki/Ambystoma_mexicanum" class="mw-redirect" title="Ambystoma mexicanum">Ambystoma mexicanum</a></i>, an organism with exceptional limb regenerative capabilities, likely undergoes <a href="/wiki/Epigenetics" title="Epigenetics">epigenetic</a> alterations in its <a href="/wiki/Blastema" title="Blastema">blastema</a> cells that enhance expression of genes involved in limb regeneration. The Axolotl has very little blood and has an excess of epidermal cells. This allows the affected area to then flourish with epidermal cells and continued gene expression allows the area to regenerate to its natural being.<sup id="cite_ref-61" class="reference"><a href="#cite_note-61"><span class="cite-bracket">[</span>61<span class="cite-bracket">]</span></a></sup> </p><p>In spite of the historically few researchers studying limb regeneration, remarkable progress has been made recently in establishing the neotenous amphibian the axolotl (<i>Ambystoma mexicanum</i>) as a model genetic organism. This progress has been facilitated by advances in <a href="/wiki/Genomics" title="Genomics">genomics</a>, <a href="/wiki/Bioinformatics" title="Bioinformatics">bioinformatics</a>, and <a href="/wiki/Somatic_cell" title="Somatic cell">somatic cell</a> <a href="/wiki/Transgenesis" class="mw-redirect" title="Transgenesis">transgenesis</a> in other fields, that have created the opportunity to investigate the mechanisms of important biological properties, such as limb regeneration, in the axolotl.<sup id="cite_ref-stepwise_54-1" class="reference"><a href="#cite_note-stepwise-54"><span class="cite-bracket">[</span>54<span class="cite-bracket">]</span></a></sup> The Ambystoma Genetic Stock Center (AGSC) is a self-sustaining, breeding colony of the axolotl supported by the <a href="/wiki/National_Science_Foundation" title="National Science Foundation">National Science Foundation</a> as a Living Stock Collection. Located at the University of Kentucky, the AGSC is dedicated to supplying genetically well-characterized axolotl embryos, larvae, and adults to laboratories throughout the United States and abroad. An <a href="/wiki/National_Institutes_of_Health" title="National Institutes of Health">NIH</a>-funded NCRR grant has led to the establishment of the Ambystoma EST database, the Salamander Genome Project (SGP) that has led to the creation of the first amphibian gene map and several annotated molecular data bases, and the creation of the research community web portal.<sup id="cite_ref-62" class="reference"><a href="#cite_note-62"><span class="cite-bracket">[</span>62<span class="cite-bracket">]</span></a></sup> In 2022, a first spatiotemporal <a href="/wiki/Brain_mapping" title="Brain mapping">map</a> revealed key insights about axolotl <a href="/w/index.php?title=Brain_regeneration&amp;action=edit&amp;redlink=1" class="new" title="Brain regeneration (page does not exist)">brain regeneration</a>, also providing the interactive <i>Axolotl Regenerative Telencephalon Interpretation via Spatiotemporal Transcriptomic Atlas</i>.<sup id="cite_ref-63" class="reference"><a href="#cite_note-63"><span class="cite-bracket">[</span>63<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-64" class="reference"><a href="#cite_note-64"><span class="cite-bracket">[</span>64<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading4"><h4 id="Frog_model">Frog model</h4><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Regeneration_(biology)&amp;action=edit&amp;section=13" title="Edit section: Frog model" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <p><a href="/wiki/Anurans" class="mw-redirect" title="Anurans">Anurans</a> (frogs) can only regenerate their limbs during embryonic development.<sup id="cite_ref-xenopus_65-0" class="reference"><a href="#cite_note-xenopus-65"><span class="cite-bracket">[</span>65<span class="cite-bracket">]</span></a></sup> Reactive oxygen species (ROS) appear to be required for a regeneration response in the anuran larvae.<sup id="cite_ref-Reya_2005_66-0" class="reference"><a href="#cite_note-Reya_2005-66"><span class="cite-bracket">[</span>66<span class="cite-bracket">]</span></a></sup> ROS production is essential to activate the Wnt signaling pathway, which has been associated with regeneration in other systems.<sup id="cite_ref-Reya_2005_66-1" class="reference"><a href="#cite_note-Reya_2005-66"><span class="cite-bracket">[</span>66<span class="cite-bracket">]</span></a></sup> </p><p>Once the limb skeleton has developed in frogs, regeneration does not occur (<i>Xenopus</i> can grow a cartilaginous spike after amputation).<sup id="cite_ref-xenopus_65-1" class="reference"><a href="#cite_note-xenopus-65"><span class="cite-bracket">[</span>65<span class="cite-bracket">]</span></a></sup> The adult <i><a href="/wiki/Xenopus_laevis" class="mw-redirect" title="Xenopus laevis">Xenopus laevis</a></i> is used as a model organism for <a href="/wiki/Regenerative_medicine" title="Regenerative medicine">regenerative medicine</a>. In 2022, a cocktail of drugs and hormones (<a href="/w/index.php?title=1,4-DPCA&amp;action=edit&amp;redlink=1" class="new" title="1,4-DPCA (page does not exist)">1,4-DPCA</a>, <a href="/wiki/BDNF" class="mw-redirect" title="BDNF">BDNF</a>, <a href="/wiki/Growth_hormone" title="Growth hormone">growth hormone</a>, <a href="/wiki/Resolvin" title="Resolvin">resolvin</a> D5, and <a href="/wiki/Retinoic_acid" title="Retinoic acid">retinoic acid</a>), in a single dose lasting 24 hours, was shown to trigger long-term leg regeneration in adult <i>X. laevis</i>. Instead of a single spike, a paddle-shaped growth is obtained at the end of the limb by 18 months.<sup id="cite_ref-67" class="reference"><a href="#cite_note-67"><span class="cite-bracket">[</span>67<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Hydra">Hydra</h3><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Regeneration_(biology)&amp;action=edit&amp;section=14" title="Edit section: Hydra" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <p><a href="/wiki/Hydra_(genus)" title="Hydra (genus)"><i>Hydra</i></a> is a genus of freshwater <a href="/wiki/Polyp_(zoology)" title="Polyp (zoology)">polyp</a> in the phylum <a href="/wiki/Cnidaria" title="Cnidaria">Cnidaria</a> with highly proliferative <a href="/wiki/Stem_cells" class="mw-redirect" title="Stem cells">stem cells</a> that gives them the ability to regenerate their entire body.<sup id="cite_ref-Bosch_2007_68-0" class="reference"><a href="#cite_note-Bosch_2007-68"><span class="cite-bracket">[</span>68<span class="cite-bracket">]</span></a></sup> Any fragment larger than a few hundred <a href="/wiki/Epithelial" class="mw-redirect" title="Epithelial">epithelial</a> cells that is isolated from the body has the ability to regenerate into a smaller version of itself.<sup id="cite_ref-Bosch_2007_68-1" class="reference"><a href="#cite_note-Bosch_2007-68"><span class="cite-bracket">[</span>68<span class="cite-bracket">]</span></a></sup> The high proportion of stem cells in the hydra supports its efficient regenerative ability.<sup id="cite_ref-Wenger_2014_69-0" class="reference"><a href="#cite_note-Wenger_2014-69"><span class="cite-bracket">[</span>69<span class="cite-bracket">]</span></a></sup> </p><p>Regeneration among hydra occurs as foot regeneration arising from the basal part of the body, and head regeneration, arising from the apical region.<sup id="cite_ref-Bosch_2007_68-2" class="reference"><a href="#cite_note-Bosch_2007-68"><span class="cite-bracket">[</span>68<span class="cite-bracket">]</span></a></sup> Regeneration tissues that are cut from the gastric region contain polarity, which allows them to distinguish between regenerating a head in the apical end and a foot in the basal end so that both regions are present in the newly regenerated organism.<sup id="cite_ref-Bosch_2007_68-3" class="reference"><a href="#cite_note-Bosch_2007-68"><span class="cite-bracket">[</span>68<span class="cite-bracket">]</span></a></sup> Head regeneration requires complex reconstruction of the area, while foot regeneration is much simpler, similar to tissue repair.<sup id="cite_ref-70" class="reference"><a href="#cite_note-70"><span class="cite-bracket">[</span>70<span class="cite-bracket">]</span></a></sup> In both foot and head regeneration, however, there are two distinct <a href="/wiki/Biochemical_cascade" title="Biochemical cascade">molecular cascades</a> that occur once the tissue is wounded: early injury response and a subsequent, signal-driven pathway of the regenerating tissue that leads to <a href="/wiki/Cellular_differentiation" title="Cellular differentiation">cellular differentiation</a>.<sup id="cite_ref-Wenger_2014_69-1" class="reference"><a href="#cite_note-Wenger_2014-69"><span class="cite-bracket">[</span>69<span class="cite-bracket">]</span></a></sup> This early-injury response includes epithelial cell stretching for wound closure, the migration of interstitial progenitors towards the wound, <a href="/wiki/Cell_death" title="Cell death">cell death</a>, <a href="/wiki/Phagocytosis" title="Phagocytosis">phagocytosis</a> of cell debris, and reconstruction of the extracellular matrix.<sup id="cite_ref-Wenger_2014_69-2" class="reference"><a href="#cite_note-Wenger_2014-69"><span class="cite-bracket">[</span>69<span class="cite-bracket">]</span></a></sup> </p><p>Regeneration in hydra has been defined as morphallaxis, the process where regeneration results from remodeling of existing material without cellular proliferation.<sup id="cite_ref-71" class="reference"><a href="#cite_note-71"><span class="cite-bracket">[</span>71<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Agata_2007_72-0" class="reference"><a href="#cite_note-Agata_2007-72"><span class="cite-bracket">[</span>72<span class="cite-bracket">]</span></a></sup> If a hydra is cut into two pieces, the remaining severed sections form two fully functional and independent hydra, approximately the same size as the two smaller severed sections.<sup id="cite_ref-Bosch_2007_68-4" class="reference"><a href="#cite_note-Bosch_2007-68"><span class="cite-bracket">[</span>68<span class="cite-bracket">]</span></a></sup> This occurs through the exchange and rearrangement of soft tissues without the formation of new material.<sup id="cite_ref-Wenger_2014_69-3" class="reference"><a href="#cite_note-Wenger_2014-69"><span class="cite-bracket">[</span>69<span class="cite-bracket">]</span></a></sup> </p><p>During Hydra head regeneration there are coordinated <a href="/wiki/Gene_expression" title="Gene expression">gene expression</a> and <a href="/wiki/Chromatin" title="Chromatin">chromatin</a> regulation changes.<sup id="cite_ref-Murad2021_73-0" class="reference"><a href="#cite_note-Murad2021-73"><span class="cite-bracket">[</span>73<span class="cite-bracket">]</span></a></sup> An <a href="/wiki/Enhancer_(genetics)" title="Enhancer (genetics)">enhancer</a> is a short DNA sequence (50–1500 base pairs) that can be bound by <a href="/wiki/Transcription_factor" title="Transcription factor">transcription factors</a> to increase the <a href="/wiki/Transcription_(biology)" title="Transcription (biology)">transcription</a> of a particular <a href="/wiki/Gene" title="Gene">gene</a>. In the enhancer regions that are activated during head regeneration, a set of transcription factor motifs commonly occur that appear to facilitate coordinated gene expression.<sup id="cite_ref-Murad2021_73-1" class="reference"><a href="#cite_note-Murad2021-73"><span class="cite-bracket">[</span>73<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Aves_(birds)"><span id="Aves_.28birds.29"></span>Aves (birds)</h3><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Regeneration_(biology)&amp;action=edit&amp;section=15" title="Edit section: Aves (birds)" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <p>Owing to a limited literature on the subject, birds are believed to have very limited regenerative abilities as adults. Some studies<sup id="cite_ref-Vorontsova_1960_74-0" class="reference"><a href="#cite_note-Vorontsova_1960-74"><span class="cite-bracket">[</span>74<span class="cite-bracket">]</span></a></sup> on roosters have suggested that birds can adequately regenerate some parts of the limbs and depending on the conditions in which regeneration takes place, such as age of the animal, the inter-relationship of the injured tissue with other muscles, and the type of operation, can involve complete regeneration of some musculoskeletal structure. Werber and Goldschmidt (1909) found that the goose and duck were capable of regenerating their beaks after partial amputation<sup id="cite_ref-Vorontsova_1960_74-1" class="reference"><a href="#cite_note-Vorontsova_1960-74"><span class="cite-bracket">[</span>74<span class="cite-bracket">]</span></a></sup> and Sidorova (1962) observed liver regeneration via hypertrophy in roosters.<sup id="cite_ref-75" class="reference"><a href="#cite_note-75"><span class="cite-bracket">[</span>75<span class="cite-bracket">]</span></a></sup> Birds are also capable of regenerating the hair cells in their cochlea following noise damage or ototoxic drug damage.<sup id="cite_ref-76" class="reference"><a href="#cite_note-76"><span class="cite-bracket">[</span>76<span class="cite-bracket">]</span></a></sup> Despite this evidence, contemporary studies suggest reparative regeneration in avian species is limited to periods during embryonic development. An array of molecular biology techniques have been successful in manipulating cellular pathways known to contribute to spontaneous regeneration in chick embryos.<sup id="cite_ref-77" class="reference"><a href="#cite_note-77"><span class="cite-bracket">[</span>77<span class="cite-bracket">]</span></a></sup> For instance, removing a portion of the elbow joint in a chick embryo via window excision or slice excision and comparing joint tissue specific markers and cartilage markers showed that window excision allowed 10 out of 20 limbs to regenerate and expressed joint genes similarly to a developing embryo. In contrast, slice excision did not allow the joint to regenerate due to the fusion of the skeletal elements seen by an expression of cartilage markers.<sup id="cite_ref-78" class="reference"><a href="#cite_note-78"><span class="cite-bracket">[</span>78<span class="cite-bracket">]</span></a></sup> </p><p>Similar to the physiological regeneration of hair in mammals, birds can regenerate their feathers in order to repair damaged feathers or to attract mates with their plumage. Typically, seasonal changes that are associated with breeding seasons will prompt a hormonal signal for birds to begin regenerating feathers. This has been experimentally induced using thyroid hormones in the Rhode Island Red Fowls.<sup id="cite_ref-79" class="reference"><a href="#cite_note-79"><span class="cite-bracket">[</span>79<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Mammals">Mammals</h3><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Regeneration_(biology)&amp;action=edit&amp;section=16" title="Edit section: Mammals" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Spiny_Mice.jpg" class="mw-file-description"><noscript><img src="//upload.wikimedia.org/wikipedia/commons/thumb/5/53/Spiny_Mice.jpg/220px-Spiny_Mice.jpg" decoding="async" width="220" height="152" class="mw-file-element" data-file-width="1108" data-file-height="768"></noscript><span class="lazy-image-placeholder" style="width: 220px;height: 152px;" data-src="//upload.wikimedia.org/wikipedia/commons/thumb/5/53/Spiny_Mice.jpg/220px-Spiny_Mice.jpg" data-width="220" data-height="152" data-srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/53/Spiny_Mice.jpg/330px-Spiny_Mice.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/53/Spiny_Mice.jpg/440px-Spiny_Mice.jpg 2x" data-class="mw-file-element">&nbsp;</span></a><figcaption>Spiny mice (<i>Acomys cahirinus</i> pictured here) can regenerate skin, cartilage, nerves and muscle.</figcaption></figure> <p>Mammals are capable of cellular and physiological regeneration, but have generally poor reparative regenerative ability across the group.<sup id="cite_ref-Birbrair_2298–2314_1-2" class="reference"><a href="#cite_note-Birbrair_2298%E2%80%932314-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Seifert_AW_2012_27-1" class="reference"><a href="#cite_note-Seifert_AW_2012-27"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup> Examples of physiological regeneration in mammals include epithelial renewal (e.g., skin and intestinal tract), red blood cell replacement, <a href="/wiki/Antler" title="Antler">antler</a> regeneration and hair cycling.<sup id="cite_ref-80" class="reference"><a href="#cite_note-80"><span class="cite-bracket">[</span>80<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-81" class="reference"><a href="#cite_note-81"><span class="cite-bracket">[</span>81<span class="cite-bracket">]</span></a></sup> Male deer lose their antlers annually during the months of January to April then through regeneration are able to regrow them as an example of physiological regeneration. A deer antler is the only appendage of a mammal that can be regrown every year.<sup id="cite_ref-Price_2004_82-0" class="reference"><a href="#cite_note-Price_2004-82"><span class="cite-bracket">[</span>82<span class="cite-bracket">]</span></a></sup> While reparative regeneration is a rare phenomenon in mammals, it does occur. A well-documented example is regeneration of the digit tip distal to the nail bed.<sup id="cite_ref-83" class="reference"><a href="#cite_note-83"><span class="cite-bracket">[</span>83<span class="cite-bracket">]</span></a></sup> Reparative regeneration has also been observed in rabbits, pikas and African spiny mice. In 2012, researchers discovered that two species of <a href="/wiki/Spiny_mouse" title="Spiny mouse">African spiny mice</a>, <i>Acomys kempi</i> and <i>Acomys percivali</i>, were capable of completely regenerating the <a href="/wiki/Autotomy" title="Autotomy">autotomically</a> released or otherwise damaged tissue. These species can regrow hair follicles, skin, <a href="/wiki/Sweat_glands" class="mw-redirect" title="Sweat glands">sweat glands</a>, fur and cartilage.<sup id="cite_ref-84" class="reference"><a href="#cite_note-84"><span class="cite-bracket">[</span>84<span class="cite-bracket">]</span></a></sup> In addition to these two species, subsequent studies demonstrated that <i>Acomys cahirinus</i> could regenerate skin and excised tissue in the ear pinna.<sup id="cite_ref-Gawriluk_2016_85-0" class="reference"><a href="#cite_note-Gawriluk_2016-85"><span class="cite-bracket">[</span>85<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-86" class="reference"><a href="#cite_note-86"><span class="cite-bracket">[</span>86<span class="cite-bracket">]</span></a></sup> </p><p>Despite these examples, it is generally accepted that adult <a href="/wiki/Mammal" title="Mammal">mammals</a> have limited regenerative capacity compared to most <a href="/wiki/Vertebrate" title="Vertebrate">vertebrate</a> embryos/larvae, adult salamanders and fish.<sup id="cite_ref-87" class="reference"><a href="#cite_note-87"><span class="cite-bracket">[</span>87<span class="cite-bracket">]</span></a></sup> But the regeneration therapy approach of <a href="/wiki/Robert_O._Becker" title="Robert O. Becker">Robert O. Becker</a>, using electrical stimulation, has shown promising results for rats<sup id="cite_ref-88" class="reference"><a href="#cite_note-88"><span class="cite-bracket">[</span>88<span class="cite-bracket">]</span></a></sup> and mammals in general.<sup id="cite_ref-89" class="reference"><a href="#cite_note-89"><span class="cite-bracket">[</span>89<span class="cite-bracket">]</span></a></sup> </p><p>Some researchers have also claimed that the <a href="/wiki/Murphy_Roths_large" title="Murphy Roths large">MRL mouse</a> strain exhibits enhanced regenerative abilities. Work comparing the differential <a href="/wiki/Gene_expression" title="Gene expression">gene expression</a> of scarless healing MRL mice and a poorly-healing <a href="/wiki/C57BL/6" title="C57BL/6">C57BL/6</a> mouse strain, identified 36 <a href="/wiki/Gene" title="Gene">genes</a> differentiating the healing process between MRL mice and other mice.<sup id="cite_ref-90" class="reference"><a href="#cite_note-90"><span class="cite-bracket">[</span>90<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-91" class="reference"><a href="#cite_note-91"><span class="cite-bracket">[</span>91<span class="cite-bracket">]</span></a></sup> Study of the regenerative process in these animals is aimed at discovering how to duplicate them in humans, such as deactivation of the p21 gene.<sup id="cite_ref-Heber-Katz_2010_92-0" class="reference"><a href="#cite_note-Heber-Katz_2010-92"><span class="cite-bracket">[</span>92<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-93" class="reference"><a href="#cite_note-93"><span class="cite-bracket">[</span>93<span class="cite-bracket">]</span></a></sup> However, recent work has shown that MRL mice actually close small ear holes with scar tissue, rather than regeneration as originally claimed.<sup id="cite_ref-Gawriluk_2016_85-1" class="reference"><a href="#cite_note-Gawriluk_2016-85"><span class="cite-bracket">[</span>85<span class="cite-bracket">]</span></a></sup> </p><p>MRL mice are not protected against <a href="/wiki/Myocardial_infarction" title="Myocardial infarction">myocardial infarction</a>; heart regeneration in adult mammals (<a href="/wiki/Neocardiogenesis" title="Neocardiogenesis">neocardiogenesis</a>) is limited, because heart muscle cells are nearly all <a href="/wiki/G0_phase" title="G0 phase">terminally differentiated</a>. MRL mice show the same amount of cardiac injury and scar formation as normal mice after a heart attack.<sup id="cite_ref-BiochemBRC_Abdullah_2005_94-0" class="reference"><a href="#cite_note-BiochemBRC_Abdullah_2005-94"><span class="cite-bracket">[</span>94<span class="cite-bracket">]</span></a></sup> However, recent studies provide evidence that this may not always be the case, and that MRL mice can regenerate after heart damage.<sup id="cite_ref-95" class="reference"><a href="#cite_note-95"><span class="cite-bracket">[</span>95<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading4"><h4 id="Humans">Humans</h4><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Regeneration_(biology)&amp;action=edit&amp;section=17" title="Edit section: Humans" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Regeneration_in_humans" title="Regeneration in humans">Regeneration in humans</a></div><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">See also: <a href="/wiki/Tissue_engineering" title="Tissue engineering">Tissue engineering</a></div> <p>The regrowth of lost tissues or organs in the human body is being researched. Some tissues such as skin regrow quite readily; others have been thought to have little or no capacity for regeneration, but ongoing research suggests that there is some hope for a variety of tissues and organs.<sup id="cite_ref-Birbrair_2298–2314_1-3" class="reference"><a href="#cite_note-Birbrair_2298%E2%80%932314-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-CompleteRegen2_96-0" class="reference"><a href="#cite_note-CompleteRegen2-96"><span class="cite-bracket">[</span>96<span class="cite-bracket">]</span></a></sup> Human organs that have been regenerated include the bladder, vagina and the penis.<sup id="cite_ref-regen2014104_97-0" class="reference"><a href="#cite_note-regen2014104-97"><span class="cite-bracket">[</span>97<span class="cite-bracket">]</span></a></sup> </p><p>As are all <a href="/wiki/Metazoan" class="mw-redirect" title="Metazoan">metazoans</a>, humans are capable of physiological regeneration (i.e. the replacement of cells during homeostatic maintenance that does not necessitate injury). For example, the regeneration of red blood cells via erythropoiesis occurs through the maturation of erythrocytes from hematopoietic stem cells in the bone marrow, their subsequent circulation for around 90 days in the blood stream, and their eventual cell-death in the spleen.<sup id="cite_ref-98" class="reference"><a href="#cite_note-98"><span class="cite-bracket">[</span>98<span class="cite-bracket">]</span></a></sup> Another example of physiological regeneration is the sloughing and rebuilding of a functional endometrium during each menstrual cycle in females in response to varying levels of circulating estrogen and progesterone.<sup id="cite_ref-99" class="reference"><a href="#cite_note-99"><span class="cite-bracket">[</span>99<span class="cite-bracket">]</span></a></sup> </p><p>However, humans are limited in their capacity for reparative regeneration, which occurs in response to injury. One of the most studied regenerative responses in humans is the hypertrophy of the liver following liver injury.<sup id="cite_ref-Michalopoulos_1997_100-0" class="reference"><a href="#cite_note-Michalopoulos_1997-100"><span class="cite-bracket">[</span>100<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Taub_2004_101-0" class="reference"><a href="#cite_note-Taub_2004-101"><span class="cite-bracket">[</span>101<span class="cite-bracket">]</span></a></sup> For example, the original mass of the liver is re-established in direct proportion to the amount of liver removed following partial hepatectomy,<sup id="cite_ref-102" class="reference"><a href="#cite_note-102"><span class="cite-bracket">[</span>102<span class="cite-bracket">]</span></a></sup> which indicates that signals from the body regulate liver mass precisely, both positively and negatively, until the desired mass is reached. This response is considered cellular regeneration (a form of compensatory hypertrophy) where the function and mass of the liver is regenerated through the proliferation of existing mature hepatic cells (mainly <a href="/wiki/Hepatocyte" title="Hepatocyte">hepatocytes</a>), but the exact morphology of the liver is not regained.<sup id="cite_ref-Taub_2004_101-1" class="reference"><a href="#cite_note-Taub_2004-101"><span class="cite-bracket">[</span>101<span class="cite-bracket">]</span></a></sup> This process is driven by growth factor and cytokine regulated pathways.<sup id="cite_ref-Michalopoulos_1997_100-1" class="reference"><a href="#cite_note-Michalopoulos_1997-100"><span class="cite-bracket">[</span>100<span class="cite-bracket">]</span></a></sup> The normal sequence of inflammation and regeneration does not function accurately in cancer. Specifically, cytokine stimulation of cells leads to expression of genes that change cellular functions and suppress the immune response.<sup id="cite_ref-103" class="reference"><a href="#cite_note-103"><span class="cite-bracket">[</span>103<span class="cite-bracket">]</span></a></sup> </p><p>Adult neurogenesis is also a form of cellular regeneration. For example, hippocampal neuron renewal occurs in normal adult humans at an annual turnover rate of 1.75% of neurons.<sup id="cite_ref-104" class="reference"><a href="#cite_note-104"><span class="cite-bracket">[</span>104<span class="cite-bracket">]</span></a></sup> Cardiac myocyte renewal has been found to occur in normal adult humans,<sup id="cite_ref-105" class="reference"><a href="#cite_note-105"><span class="cite-bracket">[</span>105<span class="cite-bracket">]</span></a></sup> and at a higher rate in adults following acute heart injury such as infarction.<sup id="cite_ref-106" class="reference"><a href="#cite_note-106"><span class="cite-bracket">[</span>106<span class="cite-bracket">]</span></a></sup> Even in adult <a href="/wiki/Myocardium" class="mw-redirect" title="Myocardium">myocardium</a> following infarction, proliferation is only found in around 1% of myocytes around the area of injury, which is not enough to restore function of <a href="/wiki/Cardiac_muscle" title="Cardiac muscle">cardiac muscle</a>. However, this may be an important target for regenerative medicine as it implies that regeneration of cardiomyocytes, and consequently of myocardium, can be induced. </p><p>Another example of reparative regeneration in humans is fingertip regeneration, which occurs after phalanx amputation distal to the nail bed (especially in children)<sup id="cite_ref-107" class="reference"><a href="#cite_note-107"><span class="cite-bracket">[</span>107<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-108" class="reference"><a href="#cite_note-108"><span class="cite-bracket">[</span>108<span class="cite-bracket">]</span></a></sup> and rib regeneration, which occurs following osteotomy for <a href="/wiki/Scoliosis" title="Scoliosis">scoliosis</a> treatment (though usually regeneration is only partial and may take up to one year).<sup id="cite_ref-109" class="reference"><a href="#cite_note-109"><span class="cite-bracket">[</span>109<span class="cite-bracket">]</span></a></sup> </p><p>Yet another example of regeneration in humans is <a href="/wiki/Vas_deferens" title="Vas deferens">vas deferens</a> regeneration, which occurs after a <a href="/wiki/Vasectomy" title="Vasectomy">vasectomy</a> and which results in vasectomy failure.<sup id="cite_ref-110" class="reference"><a href="#cite_note-110"><span class="cite-bracket">[</span>110<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Reptiles">Reptiles</h3><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Regeneration_(biology)&amp;action=edit&amp;section=18" title="Edit section: Reptiles" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <p>The ability and degree of regeneration in reptiles differs among the various species (see <sup id="cite_ref-Alibardi_and_Meyer-Rochow_2021_111-0" class="reference"><a href="#cite_note-Alibardi_and_Meyer-Rochow_2021-111"><span class="cite-bracket">[</span>111<span class="cite-bracket">]</span></a></sup>), but the most notable and well-studied occurrence is tail-regeneration in <a href="/wiki/Lizards" class="mw-redirect" title="Lizards">lizards</a>.<sup id="cite_ref-Alibardi_2010_112-0" class="reference"><a href="#cite_note-Alibardi_2010-112"><span class="cite-bracket">[</span>112<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-McLean_2011_113-0" class="reference"><a href="#cite_note-McLean_2011-113"><span class="cite-bracket">[</span>113<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Bellairs_1985_114-0" class="reference"><a href="#cite_note-Bellairs_1985-114"><span class="cite-bracket">[</span>114<span class="cite-bracket">]</span></a></sup> In addition to lizards, regeneration has been observed in the tails and <a href="/wiki/Maxilla" title="Maxilla">maxillary bone</a> of <a href="/wiki/Crocodiles" class="mw-redirect" title="Crocodiles">crocodiles</a> and adult neurogenesis has also been noted.<sup id="cite_ref-Alibardi_2010_112-1" class="reference"><a href="#cite_note-Alibardi_2010-112"><span class="cite-bracket">[</span>112<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-115" class="reference"><a href="#cite_note-115"><span class="cite-bracket">[</span>115<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-116" class="reference"><a href="#cite_note-116"><span class="cite-bracket">[</span>116<span class="cite-bracket">]</span></a></sup> Tail regeneration has never been observed in <a href="/wiki/Snakes" class="mw-redirect" title="Snakes">snakes</a>, but see.<sup id="cite_ref-Alibardi_and_Meyer-Rochow_2021_111-1" class="reference"><a href="#cite_note-Alibardi_and_Meyer-Rochow_2021-111"><span class="cite-bracket">[</span>111<span class="cite-bracket">]</span></a></sup> Lizards possess the highest regenerative capacity as a group.<sup id="cite_ref-McLean_2011_113-1" class="reference"><a href="#cite_note-McLean_2011-113"><span class="cite-bracket">[</span>113<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Bellairs_1985_114-1" class="reference"><a href="#cite_note-Bellairs_1985-114"><span class="cite-bracket">[</span>114<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-117" class="reference"><a href="#cite_note-117"><span class="cite-bracket">[</span>117<span class="cite-bracket">]</span></a></sup> Following <a href="/wiki/Autotomy" title="Autotomy">autotomous</a> tail loss, epimorphic regeneration of a new tail proceeds through a blastema-mediated process that results in a functionally and morphologically similar structure.<sup id="cite_ref-Alibardi_2010_112-2" class="reference"><a href="#cite_note-Alibardi_2010-112"><span class="cite-bracket">[</span>112<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-McLean_2011_113-2" class="reference"><a href="#cite_note-McLean_2011-113"><span class="cite-bracket">[</span>113<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Chondrichthyes">Chondrichthyes</h3><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Regeneration_(biology)&amp;action=edit&amp;section=19" title="Edit section: Chondrichthyes" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <p>It has been estimated that the average shark loses about 30,000 to 40,000 teeth in a lifetime. <a href="/wiki/Leopard_shark" title="Leopard shark">Leopard sharks</a> routinely replace their teeth every 9–12 days and this is an example of physiological regeneration. This can occur because shark teeth are not attached to a bone, but instead are developed within a bony cavity.<sup id="cite_ref-Vorontsova_1960_74-2" class="reference"><a href="#cite_note-Vorontsova_1960-74"><span class="cite-bracket">[</span>74<span class="cite-bracket">]</span></a></sup> </p><p><a href="/wiki/Rhodopsin" title="Rhodopsin">Rhodopsin</a> regeneration has been studied in skates and rays. After complete photo-bleaching, <a href="/wiki/Rhodopsin" title="Rhodopsin">rhodopsin</a> can completely regenerate within 2 hours in the <a href="/wiki/Retina" title="Retina">retina</a>.<sup id="cite_ref-Sun_1993_118-0" class="reference"><a href="#cite_note-Sun_1993-118"><span class="cite-bracket">[</span>118<span class="cite-bracket">]</span></a></sup> </p><p>White <a href="/wiki/Hemiscylliidae" title="Hemiscylliidae">bamboo sharks</a> can regenerate at least two-thirds of their liver and this has been linked to three micro RNAs, xtr-miR-125b, fru-miR-204, and has-miR-142-3p_R-. In one study, two-thirds of the liver was removed and within 24 hours more than half of the liver had undergone <a href="/wiki/Hypertrophy" title="Hypertrophy">hypertrophy</a>.<sup id="cite_ref-Lu_2013_119-0" class="reference"><a href="#cite_note-Lu_2013-119"><span class="cite-bracket">[</span>119<span class="cite-bracket">]</span></a></sup> </p><p>Some sharks can regenerate scales and even skin following damage. Within two weeks of skin wounding, <a href="/wiki/Mucus" title="Mucus">mucus</a> is secreted into the wound and this initiates the healing process. One study showed that the majority of the wounded area was regenerated within 4 months, but the regenerated area also showed a high degree of variability.<sup id="cite_ref-Reif_1978_120-0" class="reference"><a href="#cite_note-Reif_1978-120"><span class="cite-bracket">[</span>120<span class="cite-bracket">]</span></a></sup> </p> </section><div class="mw-heading mw-heading2 section-heading" onclick="mfTempOpenSection(5)"><span class="indicator mf-icon mf-icon-expand mf-icon--small"></span><h2 id="See_also">See also</h2><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Regeneration_(biology)&amp;action=edit&amp;section=20" title="Edit section: See also" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div><section class="mf-section-5 collapsible-block" id="mf-section-5"> <ul><li><a href="/wiki/Autotomy" title="Autotomy">Autotomy</a></li> <li><a href="/wiki/Cloning" title="Cloning">Cloning</a></li> <li><a href="/wiki/Regenerative_medicine" title="Regenerative medicine">Regenerative medicine</a></li> <li><a href="/wiki/Neuroregeneration" title="Neuroregeneration">Neuroregeneration</a></li> <li><a href="/wiki/Organ_transplantation" title="Organ transplantation">Organ transplantation</a></li> <li><a href="/wiki/Epimorphosis" title="Epimorphosis">Epimorphosis</a></li> <li><a href="/wiki/Morphallaxis" title="Morphallaxis">Morphallaxis</a></li> <li><a href="/wiki/Polyphyodont" title="Polyphyodont">Polyphyodont</a></li></ul> </section><div class="mw-heading mw-heading2 section-heading" onclick="mfTempOpenSection(6)"><span class="indicator mf-icon mf-icon-expand mf-icon--small"></span><h2 id="Notes">Notes</h2><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Regeneration_(biology)&amp;action=edit&amp;section=21" title="Edit section: Notes" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div><section class="mf-section-6 collapsible-block" id="mf-section-6"> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist reflist-columns references-column-width" style="column-width: 32em;"> <ol class="references"> <li id="cite_note-Birbrair_2298–2314-1"><span class="mw-cite-backlink">^ <a href="#cite_ref-Birbrair_2298%E2%80%932314_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Birbrair_2298%E2%80%932314_1-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-Birbrair_2298%E2%80%932314_1-2"><sup><i><b>c</b></i></sup></a> <a href="#cite_ref-Birbrair_2298%E2%80%932314_1-3"><sup><i><b>d</b></i></sup></a></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output 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Elsevier Inc. p. 400. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-12-369439-3" title="Special:BookSources/978-0-12-369439-3"><bdi>978-0-12-369439-3</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=book&amp;rft.btitle=Principles+of+Regenerative+Biology&amp;rft.pages=400&amp;rft.pub=Elsevier+Inc.&amp;rft.date=2007&amp;rft.isbn=978-0-12-369439-3&amp;rft.aulast=Carlson&amp;rft.aufirst=BM&amp;rft_id=http%3A%2F%2Fwww.sciencedirect.com%2Fscience%2Fbook%2F9780123694393&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ARegeneration+%28biology%29" class="Z3988"></span></span> </li> <li id="cite_note-Gabor-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-Gabor_3-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFGaborHotchkiss1979" class="citation journal cs1">Gabor MH, Hotchkiss RD (March 1979). <a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC218319">"Parameters governing bacterial regeneration and genetic recombination after fusion of Bacillus subtilis protoplasts"</a>. <i>Journal of Bacteriology</i>. <b>137</b> (3): 1346–53. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1128%2FJB.137.3.1346-1353.1979">10.1128/JB.137.3.1346-1353.1979</a>. <a href="/wiki/PMC_(identifier)" class="mw-redirect" title="PMC (identifier)">PMC</a> <span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC218319">218319</a></span>. <a href="/wiki/PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/108246">108246</a>.</cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&amp;rft.genre=article&amp;rft.jtitle=Journal+of+Bacteriology&amp;rft.atitle=Parameters+governing+bacterial+regeneration+and+genetic+recombination+after+fusion+of+Bacillus+subtilis+protoplasts&amp;rft.volume=137&amp;rft.issue=3&amp;rft.pages=1346-53&amp;rft.date=1979-03&amp;rft_id=https%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fpmc%2Farticles%2FPMC218319%23id-name%3DPMC&amp;rft_id=info%3Apmid%2F108246&amp;rft_id=info%3Adoi%2F10.1128%2FJB.137.3.1346-1353.1979&amp;rft.aulast=Gabor&amp;rft.aufirst=MH&amp;rft.au=Hotchkiss%2C+RD&amp;rft_id=https%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fpmc%2Farticles%2FPMC218319&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ARegeneration+%28biology%29" class="Z3988"></span></span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFSinigagliaAliéTiozzo2022" class="citation cs2">Sinigaglia, Chiara; 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title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&amp;rft.genre=article&amp;rft.jtitle=Developmental+Biology&amp;rft.atitle=Expression+of+HoxD+genes+in+developing+and+regenerating+axolotl+limbs&amp;rft.volume=200&amp;rft.issue=2&amp;rft.pages=225-33&amp;rft.date=1998-08&amp;rft_id=info%3Adoi%2F10.1006%2Fdbio.1998.8956&amp;rft_id=info%3Apmid%2F9705229&amp;rft.aulast=Torok&amp;rft.aufirst=MA&amp;rft.au=Gardiner%2C+DM&amp;rft.au=Shubin%2C+NH&amp;rft.au=Bryant%2C+SV&amp;rft_id=https%3A%2F%2Fdoi.org%2F10.1006%252Fdbio.1998.8956&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ARegeneration+%28biology%29" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFPuttaSmithWalkerRondet2004" class="citation journal cs1">Putta S, Smith JJ, Walker JA, Rondet M, Weisrock DW, Monaghan J, Samuels AK, Kump K, King DC, Maness NJ, Habermann B, Tanaka E, Bryant SV, Gardiner DM, Parichy DM, Voss SR (August 2004). <a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC509418">"From biomedicine to natural history research: EST resources for ambystomatid salamanders"</a>. <i>BMC Genomics</i>. <b>5</b> (1): 54. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.1186%2F1471-2164-5-54">10.1186/1471-2164-5-54</a></span>. <a href="/wiki/PMC_(identifier)" class="mw-redirect" title="PMC (identifier)">PMC</a> <span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC509418">509418</a></span>. <a href="/wiki/PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/15310388">15310388</a>.</cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&amp;rft.genre=article&amp;rft.jtitle=BMC+Genomics&amp;rft.atitle=From+biomedicine+to+natural+history+research%3A+EST+resources+for+ambystomatid+salamanders&amp;rft.volume=5&amp;rft.issue=1&amp;rft.pages=54&amp;rft.date=2004-08&amp;rft_id=https%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fpmc%2Farticles%2FPMC509418%23id-name%3DPMC&amp;rft_id=info%3Apmid%2F15310388&amp;rft_id=info%3Adoi%2F10.1186%2F1471-2164-5-54&amp;rft.aulast=Putta&amp;rft.aufirst=S&amp;rft.au=Smith%2C+JJ&amp;rft.au=Walker%2C+JA&amp;rft.au=Rondet%2C+M&amp;rft.au=Weisrock%2C+DW&amp;rft.au=Monaghan%2C+J&amp;rft.au=Samuels%2C+AK&amp;rft.au=Kump%2C+K&amp;rft.au=King%2C+DC&amp;rft.au=Maness%2C+NJ&amp;rft.au=Habermann%2C+B&amp;rft.au=Tanaka%2C+E&amp;rft.au=Bryant%2C+SV&amp;rft.au=Gardiner%2C+DM&amp;rft.au=Parichy%2C+DM&amp;rft.au=Voss%2C+SR&amp;rft_id=https%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fpmc%2Farticles%2FPMC509418&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ARegeneration+%28biology%29" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFAndrews2008" class="citation news cs1">Andrews, Wyatt (March 23, 2008). <a rel="nofollow" class="external text" href="https://www.cbsnews.com/news/medicines-cutting-edge-re-growing-organs/">"Medicine's Cutting Edge: Re-Growing Organs"</a>. <i><a href="/wiki/CBS_News_Sunday_Morning" title="CBS News Sunday Morning">Sunday Morning</a></i>. <a href="/wiki/CBS_News" title="CBS News">CBS News</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20080324220616/http://www.cbsnews.com/stories/2008/03/22/sunday/main3960219.shtml">Archived</a> from the original on 2008-03-24.</cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&amp;rft.genre=article&amp;rft.jtitle=Sunday+Morning&amp;rft.atitle=Medicine%27s+Cutting+Edge%3A+Re-Growing+Organs&amp;rft.date=2008-03-23&amp;rft.aulast=Andrews&amp;rft.aufirst=Wyatt&amp;rft_id=https%3A%2F%2Fwww.cbsnews.com%2Fnews%2Fmedicines-cutting-edge-re-growing-organs%2F&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ARegeneration+%28biology%29" class="Z3988"></span></li></ul> </div> </section><div class="mw-heading mw-heading2 section-heading" onclick="mfTempOpenSection(8)"><span class="indicator mf-icon mf-icon-expand mf-icon--small"></span><h2 id="Further_reading">Further reading</h2><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Regeneration_(biology)&amp;action=edit&amp;section=23" title="Edit section: Further reading" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div><section class="mf-section-8 collapsible-block" id="mf-section-8"> <ul><li><a href="/wiki/Kevin_Strange" title="Kevin Strange">Kevin Strange</a> and <a href="/w/index.php?title=Viravuth_Yin&amp;action=edit&amp;redlink=1" class="new" title="Viravuth Yin (page does not exist)">Viravuth Yin</a>, "A Shot at Regeneration: A once abandoned drug compound shows an ability to rebuild organs damaged by illness and injury", <i><a href="/wiki/Scientific_American" title="Scientific American">Scientific American</a></i>, vol. 320, no. 4 (April 2019), pp. 56–61.</li></ul> </section><div class="mw-heading mw-heading2 section-heading" onclick="mfTempOpenSection(9)"><span class="indicator mf-icon mf-icon-expand mf-icon--small"></span><h2 id="External_links">External links</h2><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Regeneration_(biology)&amp;action=edit&amp;section=24" title="Edit section: External links" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div><section class="mf-section-9 collapsible-block" id="mf-section-9"> <style data-mw-deduplicate="TemplateStyles:r1235681985">.mw-parser-output .side-box{margin:4px 0;box-sizing:border-box;border:1px solid #aaa;font-size:88%;line-height:1.25em;background-color:var(--background-color-interactive-subtle,#f8f9fa);display:flow-root}.mw-parser-output .side-box-abovebelow,.mw-parser-output .side-box-text{padding:0.25em 0.9em}.mw-parser-output .side-box-image{padding:2px 0 2px 0.9em;text-align:center}.mw-parser-output .side-box-imageright{padding:2px 0.9em 2px 0;text-align:center}@media(min-width:500px){.mw-parser-output .side-box-flex{display:flex;align-items:center}.mw-parser-output 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href="https://en.wikiquote.org/wiki/Special:Search/Regeneration_(biology)" class="extiw" title="q:Special:Search/Regeneration (biology)">Regeneration (biology)</a></b></i>.</div></div> </div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1235681985"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1237033735"><div class="side-box side-box-right plainlinks sistersitebox"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1126788409"> <div class="side-box-flex"> <div class="side-box-image"><span class="noviewer" typeof="mw:File"><span><noscript><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Wikisource-logo.svg/38px-Wikisource-logo.svg.png" decoding="async" width="38" height="40" class="mw-file-element" data-file-width="410" data-file-height="430"></noscript><span class="lazy-image-placeholder" style="width: 38px;height: 40px;" data-src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Wikisource-logo.svg/38px-Wikisource-logo.svg.png" data-alt="" data-width="38" data-height="40" data-srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Wikisource-logo.svg/57px-Wikisource-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Wikisource-logo.svg/76px-Wikisource-logo.svg.png 2x" data-class="mw-file-element">&nbsp;</span></span></span></div> <div class="side-box-text plainlist"><a href="/wiki/Wikisource" title="Wikisource">Wikisource</a> has the text of the <a href="/wiki/Encyclop%C3%A6dia_Britannica_Eleventh_Edition" title="Encyclopædia Britannica Eleventh Edition">1911 <i>Encyclopædia Britannica</i></a> article "<span style="font-weight:bold;"><a href="https://en.wikisource.org/wiki/1911_Encyclop%C3%A6dia_Britannica/Regeneration_of_Lost_Parts" class="extiw" title="wikisource:1911 Encyclopædia Britannica/Regeneration of Lost Parts">Regeneration of Lost Parts</a></span>".</div></div> </div> <ul><li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFRines1920" class="citation encyclopaedia cs1">Rines, George Edwin, ed. (1920). <span class="cs1-ws-icon" title="s:The Encyclopedia Americana (1920)/Regeneration (zoology)"><a class="external text" href="https://en.wikisource.org/wiki/The_Encyclopedia_Americana_(1920)/Regeneration_(zoology)">"Regeneration, in zoology" </a></span>. <i><a href="/wiki/Encyclopedia_Americana" title="Encyclopedia Americana">Encyclopedia Americana</a></i>.</cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=bookitem&amp;rft.atitle=Regeneration%2C+in+zoology&amp;rft.btitle=Encyclopedia+Americana&amp;rft.date=1920&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ARegeneration+%28biology%29" class="Z3988"></span></li></ul> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output 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Rendering was triggered because: page-view --> </section></div> <!-- MobileFormatter took 0.052 seconds --><!--esi <esi:include src="/esitest-fa8a495983347898/content" /> --><noscript><img src="https://login.m.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1&amp;mobile=1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://en.wikipedia.org/w/index.php?title=Regeneration_(biology)&amp;oldid=1247418824">https://en.wikipedia.org/w/index.php?title=Regeneration_(biology)&amp;oldid=1247418824</a>"</div></div> </div> <div class="post-content" id="page-secondary-actions"> </div> </main> <footer class="mw-footer minerva-footer" role="contentinfo"> <a class="last-modified-bar" href="/w/index.php?title=Regeneration_(biology)&amp;action=history"> <div class="post-content last-modified-bar__content"> <span class="minerva-icon minerva-icon-size-medium 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href="https://az.wikipedia.org/wiki/Regenerasiya" title="Regenerasiya – Azerbaijani" lang="az" hreflang="az" data-title="Regenerasiya" data-language-autonym="Azərbaycanca" data-language-local-name="Azerbaijani" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%A0%D0%B5%D0%B3%D0%B5%D0%BD%D0%B5%D1%80%D0%B0%D1%86%D0%B8%D1%8F" title="Регенерация – Bulgarian" lang="bg" hreflang="bg" data-title="Регенерация" data-language-autonym="Български" data-language-local-name="Bulgarian" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Regeneracija_(biologija)" title="Regeneracija (biologija) – Bosnian" lang="bs" hreflang="bs" data-title="Regeneracija (biologija)" data-language-autonym="Bosanski" data-language-local-name="Bosnian" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Regeneraci%C3%B3" title="Regeneració – Catalan" lang="ca" hreflang="ca" data-title="Regeneració" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Regenerace" title="Regenerace – Czech" lang="cs" hreflang="cs" data-title="Regenerace" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Regeneration_(Physiologie)" title="Regeneration (Physiologie) – German" lang="de" hreflang="de" data-title="Regeneration (Physiologie)" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Regeneratsioon" title="Regeneratsioon – Estonian" lang="et" hreflang="et" data-title="Regeneratsioon" data-language-autonym="Eesti" data-language-local-name="Estonian" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%91%CE%BD%CE%B1%CE%B3%CE%AD%CE%BD%CE%BD%CE%B7%CF%83%CE%B7_(%CE%B2%CE%B9%CE%BF%CE%BB%CE%BF%CE%B3%CE%AF%CE%B1)" title="Αναγέννηση (βιολογία) – Greek" lang="el" hreflang="el" data-title="Αναγέννηση (βιολογία)" data-language-autonym="Ελληνικά" data-language-local-name="Greek" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Regeneraci%C3%B3n_(biolog%C3%ADa)" title="Regeneración (biología) – Spanish" lang="es" hreflang="es" data-title="Regeneración (biología)" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Birsorkuntza" title="Birsorkuntza – Basque" lang="eu" hreflang="eu" data-title="Birsorkuntza" data-language-autonym="Euskara" data-language-local-name="Basque" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%A8%D8%A7%D8%B2%D8%B3%D8%A7%D8%B2%DB%8C_(%D8%B2%DB%8C%D8%B3%D8%AA%E2%80%8C%D8%B4%D9%86%D8%A7%D8%B3%DB%8C)" title="بازسازی (زیست‌شناسی) – Persian" lang="fa" hreflang="fa" data-title="بازسازی (زیست‌شناسی)" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/R%C3%A9g%C3%A9n%C3%A9ration" title="Régénération – French" lang="fr" hreflang="fr" data-title="Régénération" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/Athghini%C3%BAint_(bitheola%C3%ADocht)" title="Athghiniúint (bitheolaíocht) – Irish" lang="ga" hreflang="ga" data-title="Athghiniúint (bitheolaíocht)" data-language-autonym="Gaeilge" data-language-local-name="Irish" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Rexeneraci%C3%B3n" title="Rexeneración – Galician" lang="gl" hreflang="gl" data-title="Rexeneración" data-language-autonym="Galego" data-language-local-name="Galician" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%9E%AC%EC%83%9D_(%EC%83%9D%EB%AC%BC%ED%95%99)" title="재생 (생물학) – Korean" lang="ko" hreflang="ko" data-title="재생 (생물학)" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D5%8C%D5%A5%D5%A3%D5%A5%D5%B6%D5%A5%D6%80%D5%A1%D6%81%D5%B8%D6%82%D5%B4_(%D5%AF%D5%A5%D5%B6%D5%BD%D5%A1%D5%A2%D5%A1%D5%B6%D5%B8%D6%82%D5%A9%D5%B5%D5%B8%D6%82%D5%B6)" title="Ռեգեներացում (կենսաբանություն) – Armenian" lang="hy" hreflang="hy" data-title="Ռեգեներացում (կենսաբանություն)" data-language-autonym="Հայերեն" data-language-local-name="Armenian" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Regeneracija" title="Regeneracija – Croatian" lang="hr" hreflang="hr" data-title="Regeneracija" data-language-autonym="Hrvatski" data-language-local-name="Croatian" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-io mw-list-item"><a href="https://io.wikipedia.org/wiki/Regenero" title="Regenero – Ido" lang="io" hreflang="io" data-title="Regenero" data-language-autonym="Ido" data-language-local-name="Ido" class="interlanguage-link-target"><span>Ido</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Regenerasi_(biologi)" title="Regenerasi (biologi) – Indonesian" lang="id" hreflang="id" data-title="Regenerasi (biologi)" data-language-autonym="Bahasa Indonesia" data-language-local-name="Indonesian" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Rigenerazione_(biologia)" title="Rigenerazione (biologia) – Italian" lang="it" hreflang="it" data-title="Rigenerazione (biologia)" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%A8%D7%92%D7%A0%D7%A8%D7%A6%D7%99%D7%94" title="רגנרציה – Hebrew" lang="he" hreflang="he" data-title="רגנרציה" data-language-autonym="עברית" data-language-local-name="Hebrew" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-ka mw-list-item"><a href="https://ka.wikipedia.org/wiki/%E1%83%A0%E1%83%94%E1%83%92%E1%83%94%E1%83%9C%E1%83%94%E1%83%A0%E1%83%90%E1%83%AA%E1%83%98%E1%83%90" title="რეგენერაცია – Georgian" lang="ka" hreflang="ka" data-title="რეგენერაცია" data-language-autonym="ქართული" data-language-local-name="Georgian" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%A0%D0%B5%D0%B3%D0%B5%D0%BD%D0%B5%D1%80%D0%B0%D1%86%D0%B8%D1%8F" title="Регенерация – Kazakh" lang="kk" hreflang="kk" data-title="Регенерация" data-language-autonym="Қазақша" data-language-local-name="Kazakh" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-ht mw-list-item"><a href="https://ht.wikipedia.org/wiki/Rejenerasyon" title="Rejenerasyon – Haitian Creole" lang="ht" hreflang="ht" data-title="Rejenerasyon" data-language-autonym="Kreyòl ayisyen" data-language-local-name="Haitian Creole" class="interlanguage-link-target"><span>Kreyòl ayisyen</span></a></li><li class="interlanguage-link interwiki-ky mw-list-item"><a href="https://ky.wikipedia.org/wiki/%D0%A0%D0%B5%D0%B3%D0%B5%D0%BD%D0%B5%D1%80%D0%B0%D1%86%D0%B8%D1%8F" title="Регенерация – Kyrgyz" lang="ky" hreflang="ky" data-title="Регенерация" data-language-autonym="Кыргызча" data-language-local-name="Kyrgyz" class="interlanguage-link-target"><span>Кыргызча</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/Re%C4%A3ener%C4%81cija" title="Reģenerācija – Latvian" lang="lv" hreflang="lv" data-title="Reģenerācija" data-language-autonym="Latviešu" data-language-local-name="Latvian" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/Regeneracija" title="Regeneracija – Lithuanian" lang="lt" hreflang="lt" data-title="Regeneracija" data-language-autonym="Lietuvių" data-language-local-name="Lithuanian" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%A0%D0%B5%D0%B3%D0%B5%D0%BD%D0%B5%D1%80%D0%B0%D1%86%D0%B8%D1%98%D0%B0_(%D0%B1%D0%B8%D0%BE%D0%BB%D0%BE%D0%B3%D0%B8%D1%98%D0%B0)" title="Регенерација (биологија) – Macedonian" lang="mk" hreflang="mk" data-title="Регенерација (биологија)" data-language-autonym="Македонски" data-language-local-name="Macedonian" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Penjanaan_semula" title="Penjanaan semula – Malay" lang="ms" hreflang="ms" data-title="Penjanaan semula" data-language-autonym="Bahasa Melayu" data-language-local-name="Malay" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Regeneratie_(biologie)" title="Regeneratie (biologie) – Dutch" lang="nl" hreflang="nl" data-title="Regeneratie (biologie)" data-language-autonym="Nederlands" data-language-local-name="Dutch" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E5%86%8D%E7%94%9F_(%E7%94%9F%E7%89%A9%E5%AD%A6)" title="再生 (生物学) – Japanese" lang="ja" hreflang="ja" data-title="再生 (生物学)" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Regenerering_(biologi)" title="Regenerering (biologi) – Norwegian Bokmål" lang="nb" hreflang="nb" data-title="Regenerering (biologi)" data-language-autonym="Norsk bokmål" data-language-local-name="Norwegian Bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/Regeneratsiya" title="Regeneratsiya – Uzbek" lang="uz" hreflang="uz" data-title="Regeneratsiya" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="Uzbek" class="interlanguage-link-target"><span>Oʻzbekcha / ўзбекча</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Regeneracja_(biologia)" title="Regeneracja (biologia) – Polish" lang="pl" hreflang="pl" data-title="Regeneracja (biologia)" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Regenera%C3%A7%C3%A3o_(biologia)" title="Regeneração (biologia) – Portuguese" lang="pt" hreflang="pt" data-title="Regeneração (biologia)" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%A0%D0%B5%D0%B3%D0%B5%D0%BD%D0%B5%D1%80%D0%B0%D1%86%D0%B8%D1%8F" title="Регенерация – Russian" lang="ru" hreflang="ru" data-title="Регенерация" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Regeneration" title="Regeneration – Simple English" lang="en-simple" hreflang="en-simple" data-title="Regeneration" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Regener%C3%A1cia" title="Regenerácia – Slovak" lang="sk" hreflang="sk" data-title="Regenerácia" data-language-autonym="Slovenčina" data-language-local-name="Slovak" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%A0%D0%B5%D0%B3%D0%B5%D0%BD%D0%B5%D1%80%D0%B0%D1%86%D0%B8%D1%98%D0%B0" title="Регенерација – Serbian" lang="sr" hreflang="sr" data-title="Регенерација" data-language-autonym="Српски / srpski" data-language-local-name="Serbian" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Regeneracija" title="Regeneracija – Serbo-Croatian" lang="sh" hreflang="sh" data-title="Regeneracija" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="Serbo-Croatian" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Regeneraatio" title="Regeneraatio – Finnish" lang="fi" hreflang="fi" data-title="Regeneraatio" data-language-autonym="Suomi" data-language-local-name="Finnish" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Regeneration" title="Regeneration – Swedish" lang="sv" hreflang="sv" data-title="Regeneration" data-language-autonym="Svenska" data-language-local-name="Swedish" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%AE%E0%AF%80%E0%AE%B3%E0%AE%BE%E0%AE%95%E0%AF%8D%E0%AE%95%E0%AE%AE%E0%AF%8D_(%E0%AE%89%E0%AE%AF%E0%AE%BF%E0%AE%B0%E0%AE%BF%E0%AE%AF%E0%AE%B2%E0%AF%8D)" title="மீளாக்கம் (உயிரியல்) – Tamil" lang="ta" hreflang="ta" data-title="மீளாக்கம் (உயிரியல்)" data-language-autonym="தமிழ்" data-language-local-name="Tamil" class="interlanguage-link-target"><span>தமிழ்</span></a></li><li class="interlanguage-link interwiki-tt mw-list-item"><a href="https://tt.wikipedia.org/wiki/%D0%A0%D0%B5%D0%B3%D0%B5%D0%BD%D0%B5%D1%80%D0%B0%D1%86%D0%B8%D1%8F" title="Регенерация – Tatar" lang="tt" hreflang="tt" data-title="Регенерация" data-language-autonym="Татарча / tatarça" data-language-local-name="Tatar" class="interlanguage-link-target"><span>Татарча / tatarça</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Yenilenme" title="Yenilenme – Turkish" lang="tr" hreflang="tr" data-title="Yenilenme" data-language-autonym="Türkçe" data-language-local-name="Turkish" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%A0%D0%B5%D0%B3%D0%B5%D0%BD%D0%B5%D1%80%D0%B0%D1%86%D1%96%D1%8F_(%D0%B1%D1%96%D0%BE%D0%BB%D0%BE%D0%B3%D1%96%D1%8F)" title="Регенерація (біологія) – Ukrainian" lang="uk" hreflang="uk" data-title="Регенерація (біологія)" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/T%C3%A1i_sinh_(sinh_h%E1%BB%8Dc)" title="Tái sinh (sinh học) – Vietnamese" lang="vi" hreflang="vi" data-title="Tái sinh (sinh học)" data-language-autonym="Tiếng Việt" data-language-local-name="Vietnamese" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E5%86%8D%E7%94%9F" title="再生 – Chinese" lang="zh" hreflang="zh" data-title="再生" data-language-autonym="中文" data-language-local-name="Chinese" class="interlanguage-link-target"><span>中文</span></a></li></ul> </section> </div> <div class="minerva-footer-logo"><img src="/static/images/mobile/copyright/wikipedia-wordmark-en.svg" alt="Wikipedia" width="120" height="18" style="width: 7.5em; height: 1.125em;"/> </div> <ul id="footer-info" class="footer-info hlist hlist-separated"> <li id="footer-info-lastmod"> This page was last edited on 24 September 2024, at 05:58<span 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