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<main class="site-main" id="main"> <article id="post-78" class="post-78 post type-post status-publish format-standard has-post-thumbnail hentry category-nuclear-cytoplasmic-transport tag-crm1 tag-mrna-export tag-nuclear-pore-complex tag-nuclear-cytoplasmic-transport tag-nucleocytoplasmic-shuttling tag-nucleoporins tag-rangtp tag-rna-export tag-rna-export-mechanisms tag-rna-binding-proteins" itemtype="https://schema.org/CreativeWork" itemscope> <div class="inside-article"> <div class="featured-image page-header-image-single "> <img width="2560" height="1340" src="https://cellbiology.blog/archive/wp-content/uploads/2024/11/banner-20-1-min-scaled.jpg" class="attachment-full size-full" alt="" itemprop="image" decoding="async" fetchpriority="high" srcset="https://cellbiology.blog/archive/wp-content/uploads/2024/11/banner-20-1-min-scaled.jpg 2560w, https://cellbiology.blog/archive/wp-content/uploads/2024/11/banner-20-1-min-300x157.jpg 300w, https://cellbiology.blog/archive/wp-content/uploads/2024/11/banner-20-1-min-1024x536.jpg 1024w, https://cellbiology.blog/archive/wp-content/uploads/2024/11/banner-20-1-min-768x402.jpg 768w, https://cellbiology.blog/archive/wp-content/uploads/2024/11/banner-20-1-min-1536x804.jpg 1536w, https://cellbiology.blog/archive/wp-content/uploads/2024/11/banner-20-1-min-2048x1072.jpg 2048w" sizes="(max-width: 2560px) 100vw, 2560px" /> </div> <header class="entry-header"> <h1 class="entry-title" itemprop="headline">Nuclear-Cytoplasmic Transport: Key Insights into RNA Export Mechanisms</h1> <div class="entry-meta"> <span class="posted-on"><time class="entry-date published" datetime="2024-11-05T13:24:09+05:30" itemprop="datePublished">November 5, 2024</time></span> <span class="byline">by <span class="author vcard" itemprop="author" itemtype="https://schema.org/Person" itemscope><a class="url fn n" href="https://cellbiology.blog/archive/author/cellbiology/" title="View all posts by cellbiology" rel="author" itemprop="url"><span class="author-name" itemprop="name">cellbiology</span></a></span></span> </div> </header> <div class="entry-content" itemprop="text"> <h4><b>Introduction</b></h4> <p><span style="font-weight: 400;">Nuclear-cytoplasmic transport, which facilitates the transport of cellular components in and out of the nucleus as well as the cytoplasm, is quite important for cell functioning. Molecular control of the transport mechanism for certain types of molecules, in this case, RNA from the nucleus to the cytoplasm, is very crucial, particularly in the field of gene regulation, the response of cells to external stimuli, and maintenance of cellular balance. The critical importance of these RNA export pathways in various cellular activities and processes, including the control of gene expression in a cell, makes it imperative to understand these processes. The work presented here also focuses on the molecular details of the eukaryotic protein export from the nucleus, covering the major nucleocytoplasmic transport pathways, regulation, and the components involved in the process.</span></p> <h4><b>The Nuclear Pore Complex: Gatekeeper of Nuclear-Cytoplasmic Transport</b></h4> <p><span style="font-weight: 400;">The nuclear pore complex (NPC) is a proteinaceous structure that assumes a multilayered, lamellar appearance, which serves as the conduit for material exchange between the nuclear-cytoplasmic compartments. Nucleoporins constitute the core scaffold structure and operate within the NPC, which is tasked with the selective transport of proteins, RNA, and ribonucleoprotein particles. The NPC provides sites for passive diffusion, yet it is engaged in the process of recognition of transported molecules as well as transport of these molecules out of the nucleus for ensuring correctness in the export from the nucleus. Nup159p and Nup82p serve as nucleoporins whose most important role is in mRNA export since these nucleoporins bind with the transport factors for RNA that target the nucleoporins.</span></p> <h4><b>mRNA Export Pathways and the Role of the Mex67p-Mtr2p Complex</b></h4> <p><span style="font-weight: 400;">Among all the processes that participate in the nuclear export of mRNA, the Mex67p-Mtr2p complex is the one that is primarily responsible for mRNA export. It is this complex made up of proteins that binds to RNA and the nuclear pore complex and enables the movement of mRNA from the cellular nucleus to its cytoplasm. The binding of the Mex67p protein is mRNA, while the protein Mtr2p acts as a linker protein between nucleoporins and RNA exporters, thereby tethering the RNA export complex to the NPC. For the mRNA export processes, such complex formation and stabilization are critical; a misstep in any of the processes may mean a catastrophe to RNA processing and export within the nucleus.</span></p> <p></div></div> <div style="background: #f7f7f7;border: 1px solid rgba(0, 0, 0, 0.07);"> <div style="padding: 30px;"><div class="Adblock-main"> <div class="Adblock-head"> <h2>Yearwise Publication Trend on <b>“<a href="https://cellbiology.blog/publication-trends/index/nuclear cytoplasmic transport" target="_blank" title="nuclear cytoplasmic transport - yearwise publication trends">nuclear cytoplasmic transport</a>”</b></h2> </div> </div><div class="results-container"><div class="chart-block" style="padding:15px;"> <div class="left"> <div id="results" class="results"></div> </div> <div class="right"> <div class="chart-container"><canvas id="publicationChart"></canvas></div> </div> <div class="keywordsdiv"> <div style="text-align:center;"><b>Find publication trends on relevant topics</b> </div> <span class="gp-icon icon-tags"><svg viewBox="0 0 512 512" aria-hidden="true" xmlns="http://www.w3.org/2000/svg" width="1em" height="1em"><path d="M20 39.5c-8.836 0-16 7.163-16 16v176c0 4.243 1.686 8.313 4.687 11.314l224 224c6.248 6.248 16.378 6.248 22.626 0l176-176c6.244-6.244 6.25-16.364.013-22.615l-223.5-224A15.999 15.999 0 00196.5 39.5H20zm56 96c0-13.255 10.745-24 24-24s24 10.745 24 24-10.745 24-24 24-24-10.745-24-24z"></path><path d="M259.515 43.015c4.686-4.687 12.284-4.687 16.97 0l228 228c4.686 4.686 4.686 12.284 0 16.97l-180 180c-4.686 4.687-12.284 4.687-16.97 0-4.686-4.686-4.686-12.284 0-16.97L479.029 279.5 259.515 59.985c-4.686-4.686-4.686-12.284 0-16.97z"></path></svg></span> <span id="keyword-stats"></span> </div> </div></div></div><div class="inside-article"><style> table { margin: 0 0 1.5em; 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if (!statistics || Object.keys(statistics).length === 0) { resultsContainer.innerHTML = '<p>No data found.</p>'; return; } var tableHTML = `<div class='pub-scroll'> <table class='tablediv' border='1' cellspacing='0' cellpadding='0'> <tr> <th>Year</th> <th>Publication Count</th> </tr>`; Object.entries(statistics).sort(([yearA], [yearB]) => yearB - yearA).forEach(([year, count]) => { const displayCount = count === 0 ? 'NA' : count; tableHTML += ` <tr> <td>${year}</td> <td>${displayCount}</td> </tr> `; }); tableHTML += '</table></div>'; resultsContainer.innerHTML = tableHTML; } function displayLineChart(statistics) { var years = Object.keys(statistics); var counts = Object.values(statistics); var ctx = document.getElementById('publicationChart').getContext('2d'); // Destroy existing chart instance if it exists if (chart !== null) { chart.destroy(); } // Create a new chart instance chart = new Chart(ctx, { type: 'line', data: { labels: years, datasets: [{ label: 'Publication Counts', data: counts, fill: false, borderColor: 'rgba(75, 192, 192, 1)', tension: 0.1 }] }, options: { scales: { y: { beginAtZero: true } }, plugins: { legend: { display: true, position: 'top' } } } }); } function displayKeywordStats(keywords) { var resultsContainer = document.getElementById('keyword-stats'); resultsContainer.innerHTML = ''; if (!keywords || keywords.length === 0) { resultsContainer.innerHTML = '<p>No data found.</p>'; return; } var keywordHTML = ''; keywords.forEach((key, index) => { let key_replace = key.replace(/ /g, '-'); key_replace = key_replace.toLowerCase(); keywordHTML += `<a href="https://cellbiology.blog/publication-trends/index/${key_replace}" target="_blank" title="${key} - yearwise publication trends">${key}</a>`; if (index < keywords.length - 1) { keywordHTML += ', '; } }); resultsContainer.innerHTML = keywordHTML; } // Call the function with the PHP data var statistics = { "2014": 13, "2015": 16, "2016": 25, "2017": 23, "2018": 19, "2019": 28, "2020": 49, "2021": 48, "2022": 44, "2023": 81, "2024": 38 }; var keywordsArray = ["Nuclear-cytoplasmic transport","RNA export","nuclear pore complex","nucleoporins","CRM1","RanGTP","mRNA export","RNA export mechanisms","RNA-binding proteins","nucleocytoplasmic shuttling"]; displayResults(statistics); displayLineChart(statistics); displayKeywordStats(keywordsArray); </script></p> <h4><b>CRM1-Dependent Export Pathways and Nuclear Export Signals</b></h4> <p><span style="font-weight: 400;">CRM1 is also known as exportin 1, which is the other type of major export receptor with constant leucine-rich nuclear export signals (NESs) embedded in RNA-binding proteins and other different types of parcels. Such an interaction is aided by the small GTPase Ran, which is a requisite in the transport process in that it provides energy, which is directional transport. hCRM1 appears to also be a protein export receptor, facilitating the export of several forms of RNA, including messenger RNA and noncoding RRNA, by nuclear pore complex protein, which contains NES. Blocking the export of these RNA proteins by drugs like leptomycin B, which is a CRM1 inhibitor, brings to the fore the effectiveness of nuclear export mechanisms of RNA by CRM1.</span></p> <h4><b>RanGTP and Its Role in RNA Export</b><b><br /> </b></h4> <p><span style="font-weight: 400;">The regulation of nucleocytoplasmic transport depends on the functioning of the Ran GTPase cycle. There are two forms of Ran protein: RanGTP found primarily in the nucleus and RanGDP primarily found in the cytoplasm. The molecular mechanism of maintaining the Ran GTP gradient includes the compartmentalization of the Ran regulatory modules, namely its activator in the nucleus, RCC1, and its inactivator in the cytoplasm, RanGAP. The key step in the formation of RNA export complexes, such as the CRM1-RanGTP-NES, which transports RNA through the nuclear pore complex, is the incorporation of the RanGTP. In the cytoplasm, RanGTP is then hydrolyzed to RanGDP, which helps to trigger the release of the export load and permits the transport forces to return to the nucleus.</span></p> <h4><b>Regulation of RNA Export via Nucleoporins and Export Factors</b></h4> <p><span style="font-weight: 400;">As far as RNA export is concerned, nucleoporins are not merely building blocks of the NPC but also take an active role in the translocation of the RNA. For instance, Nup159p is known to interact with mRNA exporting factors and is important for the membrane attachment of exporting complexes at the NPC cytoplasmic side. Other nucleoporins, such as Nup116p, offer extra docking sites to aid RNA migration through the nuclear pore. Together with the export factors, nucleoporins are well coordinated with the transport of RNA and its regulation within the cells as the localization of RNA is preserved.</span></p> <p></div></div> <div style="background: #f7f7f7;border: 1px solid rgba(0, 0, 0, 0.07);"> <div style="padding: 30px;"><div class="Adblock-main"> <div class="Adblock-head"> <h2>Recent Publications on <b>“<a href="https://cellbiology.blog/recent-publications/index/nuclear cytoplasmic transport" target="_blank" rel="noopener" title="nuclear cytoplasmic transport - yearwise publication list">nuclear cytoplasmic transport</a>”</b></h2> </div> </div> <div class="pb-main"><div class="article-scroll"><div id="results_recent" class="results"></div></div><div class="keywordsdiv" style="margin: 0px 15px;margin-top:20px;"> <div style="text-align:center;"><b>Find publications on relevant topics</b> </div> <span class="gp-icon icon-tags"><svg viewBox="0 0 512 512" aria-hidden="true" xmlns="http://www.w3.org/2000/svg" width="1em" height="1em"><path d="M20 39.5c-8.836 0-16 7.163-16 16v176c0 4.243 1.686 8.313 4.687 11.314l224 224c6.248 6.248 16.378 6.248 22.626 0l176-176c6.244-6.244 6.25-16.364.013-22.615l-223.5-224A15.999 15.999 0 00196.5 39.5H20zm56 96c0-13.255 10.745-24 24-24s24 10.745 24 24-10.745 24-24 24-24-10.745-24-24z"></path><path d="M259.515 43.015c4.686-4.687 12.284-4.687 16.97 0l228 228c4.686 4.686 4.686 12.284 0 16.97l-180 180c-4.686 4.687-12.284 4.687-16.97 0-4.686-4.686-4.686-12.284 0-16.97L479.029 279.5 259.515 59.985c-4.686-4.686-4.686-12.284 0-16.97z"></path></svg></span> <span id="keyword-papers"></span> </div></div></div><div class="inside-article"> <style> .pb-main{ border: solid 1px #ccc; 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publicationBlock.innerHTML = publicationHTML; resultsContainer.appendChild(publicationBlock); }); } function displayKeywordPapers(keywords) { var resultsContainer = document.getElementById('keyword-papers'); resultsContainer.innerHTML = ''; if (!keywords || keywords.length === 0) { resultsContainer.innerHTML = '<p>No data found.</p>'; return; } var keywordHTML = ''; keywords.forEach((key, index) => { let key_replace = key.replace(/ /g, '-'); key_replace = key_replace.toLowerCase(); keywordHTML += `<a href="https://cellbiology.blog/recent-publications/index/${key_replace}" target="_blank" title="${key} - publication list">${key}</a>`; if (index < keywords.length - 1) { keywordHTML += ', '; } }); resultsContainer.innerHTML = keywordHTML; } // Call the function with the PHP data var recent_papers = [ { "title": "The function of the cytoplasmic dynein light chain PTKM23 in the transport of PTSMAD2 during spermatogenesis in Portunus trituberculatus.", "url": "https:\/\/pubmed.ncbi.nlm.nih.gov\/38900909", "publishedDate": "2024" }, { "title": "UBAP2L ensures homeostasis of nuclear pore complexes at the intact nuclear envelope.", "url": "https:\/\/pubmed.ncbi.nlm.nih.gov\/38652117", "publishedDate": "2024" }, { "title": "Exploring the role of macromolecular crowding and TNFR1 in cell volume control.", "url": "https:\/\/pubmed.ncbi.nlm.nih.gov\/39297502", "publishedDate": "2024" }, { "title": "Thermal Stress and Nuclear Transport.", "url": "https:\/\/pubmed.ncbi.nlm.nih.gov\/39289274", "publishedDate": "2024" }, { "title": "NEMF mutations in mice illustrate how Importin-\u03b2 specific nuclear transport defects recapitulate neurodegenerative disease hallmarks.", "url": "https:\/\/pubmed.ncbi.nlm.nih.gov\/39312574", "publishedDate": "2024" }, { "title": "Nuclear proteasomes buffer cytoplasmic proteins during autophagy compromise.", "url": "https:\/\/pubmed.ncbi.nlm.nih.gov\/39209961", "publishedDate": "2024" }, { "title": "Pathogenic TDP-43 accelerates the generation of toxic exon1 HTT in Huntington\\\\\\'s disease knock-in mice.", "url": "https:\/\/pubmed.ncbi.nlm.nih.gov\/39185703", "publishedDate": "2024" }, { "title": "Spatial resolution of HIV-1 post-entry steps in resting CD4 T\u00a0cells.", "url": "https:\/\/pubmed.ncbi.nlm.nih.gov\/38478523", "publishedDate": "2024" }, { "title": "FERONIA-mediated TIR1\/AFB2 oxidation stimulates auxin signalling in Arabidopsis.", "url": "https:\/\/pubmed.ncbi.nlm.nih.gov\/38581129", "publishedDate": "2024" }, { "title": "The high-density lipoprotein binding protein HDLBP is an unusual RNA-binding protein with multiple roles in cancer and disease.", "url": "https:\/\/pubmed.ncbi.nlm.nih.gov\/38477883", "publishedDate": "2024" }, { "title": "The ESCRT protein CHMP5 promotes T cell leukemia by controlling BRD4-p300-dependent transcription.", "url": "https:\/\/pubmed.ncbi.nlm.nih.gov\/38352301", "publishedDate": "2024" }, { "title": "Mitochondria function in cytoplasmic FeS protein biogenesis.", "url": "https:\/\/pubmed.ncbi.nlm.nih.gov\/38641180", "publishedDate": "2024" }, { "title": "Examining the molecular mechanisms of topiramate in alleviating insulin resistance: A study on C2C12 myocytes and 3T3L-1 adipocytes.", "url": "https:\/\/pubmed.ncbi.nlm.nih.gov\/38308786", "publishedDate": "2024" }, { "title": "Coordinated in confined migration: crosstalk between the nucleus and ion channel-mediated mechanosensation.", "url": "https:\/\/pubmed.ncbi.nlm.nih.gov\/38290913", "publishedDate": "2024" }, { "title": "STAT3 promotes cytoplasmic-nuclear translocation of RNA-binding protein HuR to inhibit IL-1\u03b2-induced IL-8 production.", "url": "https:\/\/pubmed.ncbi.nlm.nih.gov\/38608448", "publishedDate": "2024" }, { "title": "Murine leukemia virus infection of non-dividing dendritic cells is dependent on nucleoporins.", "url": "https:\/\/pubmed.ncbi.nlm.nih.gov\/38215165", "publishedDate": "2024" }, { "title": "YAP mechanotransduction under cyclic mechanical stretch loading for mesenchymal stem cell osteogenesis is regulated by ROCK.", "url": "https:\/\/pubmed.ncbi.nlm.nih.gov\/38274006", "publishedDate": "2024" }, { "title": "AKT-dependent nuclear localization of EPRS1 activates PARP1 in breast cancer cells.", "url": "https:\/\/pubmed.ncbi.nlm.nih.gov\/39012819", "publishedDate": "2024" }, { "title": "Importin \u03b14 deficiency induces psychiatric disorder-related behavioral deficits and neuroinflammation in mice.", "url": "https:\/\/pubmed.ncbi.nlm.nih.gov\/39379355", "publishedDate": "2024" }, { "title": "Mimicry games: NPC-like MX2 condensates trap viruses.", "url": "https:\/\/pubmed.ncbi.nlm.nih.gov\/39389027", "publishedDate": "2024" } ]; var keywordsArray = ["Nuclear-cytoplasmic transport","RNA export","nuclear pore complex","nucleoporins","CRM1","RanGTP","mRNA export","RNA export mechanisms","RNA-binding proteins","nucleocytoplasmic shuttling"]; displayResults_recent(recent_papers); displayKeywordPapers(keywordsArray); // function stripslashes(str) { // if (typeof str === 'string') { // return str.replace(/\/g, ''); // } // } </script></p> <h4><b>Intricate Interplay Between Export Factors and Nuclear Shuttling</b></h4> <p><span style="font-weight: 400;">An effective RNA export often involves more than one export factor movement between the nucleus and the cytoplasm. For example, RanBP1 and RanBP2 help to release RNA from the intracellular area of the nuclear pore complex after they arrive at the cytoplasmic side. This disassembly is an essential point in the export process in that it controls the flow direction of RNA outward and even prevents returning RNA to the nucleus. Free circulation of such factors is controlled by the RanGTP cycle and by several nuclear pore proteins, proving that the RNA export process is tightly regulated.</span></p> <h4><b>I</b><b>mplications of RNA Export Dysregulation</b></h4> <p><span style="font-weight: 400;">Therefore, defects in the ability of the cell to export RNA and/or mRNA have detrimental effects on cellular homeostasis and can lead to disease states like cancer, neurodegeneration, and viral pathologies. For example, mutations of export factors like CRM1 or nucleoporins result in cytoplasmic accumulation of mRNAs and non-coding RNAs, causing defects in the expression of certain genes. In addition to this, viruses such as HIV-1 are also known to hijack the cellular RNA exporting processes to export viral RNAs in order to increase the virus production. Many diseases cause dysregulation of the RNA export processes, and knowing how the RNA knows where and how to get exported could provide a means for curing such pathological conditions.</span></p> <h4><b>Recent Advances and Future Directions in RNA Export Research</b></h4> <p><span style="font-weight: 400;">The recent finding has made it possible to describe the novel function of nucleoporins and the nuclear export factors during RNA transport, as well as other interactions not previously addressed. Real-time imaging and biochemical methods allowed evaluation of the process of RNA export within the cells and provided more detailed information about this process. This work will proceed with further studies focused on the peripheral pores, including the search for new export factors and designing specific inhibitors of RNA export pathways. Basic cellular functions will be enhanced by these findings, whereas abnormalities in these processes caused by diseases will be treated utilizing the therapeutic targeting of RNA export.</span></p> <h4><b>Conclusion</b></h4> <p><span style="font-weight: 400;">The transport of macromolecules between the nucleus and cytoplasmic compartment is neither simple nor unstratified. Spindling of the gathering look, particularly the exportation, has several components, which makes it an easy high-manipulation process for cellular operations. It is bound for further enhancement in therapeutic avenues in connection to RNA logic bias as the systematic investigation continues to unravel the correct pathways for the manipulation of these exportation processes.</span></p> <p></p> <h4><b>References</b></h4> <ol> <li>Paraskeva, E., Izaurralde, E., Bischoff, F.R., Huber, J., Kutay, U., Hartmann, E., Lührmann, R. and Görlich, D., 1999. <a href="https://rupress.org/jcb/article-abstract/145/2/255/16113/CRM1-mediated-Recycling-of-Snurportin-1-to-the">CRM1-mediated recycling of snurportin 1 to the cytoplasm.</a> <i>The Journal of cell biology</i>, <i>145</i>(2), pp.255-264.</li> <li>Askjaer, P., Bachi, A., Wilm, M., Bischoff, F.R., Weeks, D.L., Ogniewski, V., Ohno, M., Niehrs, C., Kjems, J., Mattaj, I.W. and Fornerod, M., 1999. <a href="https://www.tandfonline.com/doi/abs/10.1128/MCB.19.9.6276">RanGTP-regulated interactions of CRM1 with nucleoporins and a shuttling DEAD-box helicase.</a> <i>Molecular and cellular biology</i>, <i>19</i>(9), pp.6276-6285.</li> <li>Neville, M. and Rosbash, M., 1999. <a href="https://www.embopress.org/doi/full/10.1093/emboj/18.13.3746">The NES–Crm1p export pathway is not a major mRNA export route in Saccharomyces cerevisiae. </a><i>The EMBO Journal</i>.</li> <li>Belgareh, N., Snay-Hodge, C., Pasteau, F., Dagher, S., Cole, C.N. and Doye, V., 1998. <a href="https://www.molbiolcell.org/doi/full/10.1091/mbc.9.12.3475">Functional characterization of a Nup159p-containing nuclear pore subcomplex.</a> <i>Molecular biology of the cell</i>, <i>9</i>(12), pp.3475-3492.</li> <li>Solsbacher, J., Maurer, P., Bischoff, F.R. and Schlenstedt, G., 1998. <a href="https://www.tandfonline.com/doi/abs/10.1128/mcb.18.11.6805">Cse1p is involved in export of yeast importin α from the nucleus.</a> <i>Molecular and cellular biology</i>.</li> <li>Aas, A., Isakson, P., Bindesbøll, C., Alemu, E.A., Klungland, A. and Simonsen, A., 2017. <a href="https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0168182">Nucleocytoplasmic shuttling of FTO does not affect starvation-induced autophagy.</a> <i>PLoS One</i>, <i>12</i>(3), p.e0168182.</li> <li>Albertini, M., Pemberton, L.F., Rosenblum, J.S. and Blobel, G., 1998. <a href="https://rupress.org/jcb/article-abstract/143/6/1447/15968/A-Novel-Nuclear-Import-Pathway-for-the">A novel nuclear import pathway for the transcription factor TFIIS.</a> <i>The Journal of cell biology</i>, <i>143</i>(6), pp.1447-1455.</li> </ol> <p></div></div> <div style="background: #f7f7f7;border: 1px solid rgba(0, 0, 0, 0.07);"> <div style="padding: 30px;"><div class="Adblock-main"> <div class="Adblock-head"> <h2>Top Experts on “<b style="color:#000;font-size:22px;">nuclear cytoplasmic transport</b>“</h2> </div> </div><div class="author-main"><div id="results_author"></div><div style="text-align: center;"><a class="register-button" href="https://cellbiology.blog/expert-search" target="_blank" rel="noopener">Find experts on any field</a></div></div><div class="inside-article" style="background: none;border: none;box-shadow: none;margin-top: -70px;"> <style> .author-block { padding: 15px; 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