Recombinant Proteins Supplier

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url('https://resources.bio-techne.com/bio-techne-assets/images/research-areas/obt-pala-hero-gradient-background-1500x340.png'); background-position: top center; background-repeat: no-repeat; background-size: cover;"> <div> <div class="paragraph paragraph--type--h1-2-2-text-to-media paragraph--view-mode--default"> <div class="container-fluid container-wide"> <div class="layout layout--twocol-section layout--twocol-section--50-50"> <div class="layout__region layout__region--first"> <div class="hero-content-wrap"> <div class="field_block:paragraph:h1_2_2_text_to_media:field_indv_h1"> <div><h1>Recombinant Proteins</h1></div> </div> <div class="field_block:paragraph:h1_2_2_text_to_media:field_lg_sngl_frmtd_text_global"> <div><p>Bio-Techne offers over 5,000 R&D Systems™ bioactive recombinant proteins spanning 35 species and multiple research areas. Our portfolio includes cytokines and growth factors, proteins for studying immuno-oncology targets, enzymes, Animal-Free and GMP-grade proteins, custom protein development services, and more.</p></div> </div> <div class="field_block:paragraph:h1_2_2_text_to_media:field_call_to_action_global"> <a href="/search?keywords=protein&category_attr=Proteins%20and%20Enzymes" class="btn btn-primary" type="link"> Find Your Protein </a> </div> </div> </div> <div class="layout__region layout__region--second"> <div class="hero-content-wrap"> <div class="field_block:paragraph:h1_2_2_text_to_media:field_indv_media"> <div> <img src="https://resources.bio-techne.com/bio-techne-assets/images/research-areas/proteinSolo06.png" alt="Proteins" fetchpriority="high" > </div> </div> </div> </div> </div> </div> </div> </div> </div> </section> </div> </div> </header> </div> <div id="main" class="container-fluid container-wide"> <div class="row"> <div class="col-md-12"> <div> <div id="block-bio-techne-global-breadcrumbs" class="system_breadcrumb_block"> <nav role="navigation" aria-labelledby="system-breadcrumb"> <h2 id="system-breadcrumb" class="visually-hidden">Breadcrumb</h2> <ol> <li> <a href="/">Home</a> </li> <li> <a href="/reagents">Bio-Techne Reagents</a> </li> <li> Proteins </li> </ol> </nav> </div> </div> </div> </div> <main> <section class="section"> <div> <div id="block-bio-techne-global-content" class="system_main_block"> <article> <div> <div> <div> <div class="paragraph paragraph--type--freeform mb-4 paragraph--view-mode--default"> <div><p> <a href="#featured">Featured Products</a> | <a href="#competitor">Proteins by Research Area</a> | <a href="#testimonials">Customer Testimonials</a> | <a href="#related">Related Resources</a> | <a href="#background">Background Information</a></p></div> </div> </div> <div> <div class="paragraph accordion mb-4 paragraph--type--extendable-paragraph paragraph--view-mode--default"> <div class="card-header rounded-top bg-white"> <a class="collapsed" data-toggle="collapse" href="#expPara-key-benefits-of-rampd-systems-recombinant-proteins1" role="button" aria-expanded="false" aria-controls="expPara"> <h5>Key Benefits of R&D Systems Recombinant Proteins</h5> </a> </div> <div class="collapse" id="expPara-key-benefits-of-rampd-systems-recombinant-proteins1" aria-expanded="false" aria-controls="expPara"> <div class="card-body p-4"> <br/> <div><ul> <li><strong>High Levels of Biological Activity</strong>: The biological activity of each protein is tested in an appropriate biological system to confirm that it meets our strict QC activity parameters before it is released to market.</li> <li><strong>Lot-to-Lot Consistency</strong>: Minimal lot-to-lot variability is ensured by maintaining consistent manufacturing conditions and testing each new lot side-by-side with previous lots, so you don’t have to worry whether results will be reproducible over time.</li> <li><strong>High Purity</strong>: The majority of our proteins have >95% purity and a guaranteed industry-leading endotoxin level of <0.1 EU/ug by the LAL method.</li> <li><strong>Long-term Stability</strong>: The bioactivity and physical state of our proteins are monitored through multiple freeze/thaw cycles, so you can be confident that your protein will be stable over long periods of time. All proteins are shipped lyophilized or in specially optimized formulations to ensure that they reach you in perfect condition.</li> <li><strong>Comprehensive Selection:</strong> Our catalog includes over 5,000 biologically active recombinant and natural proteins spanning 35 species, and more than 10,000 non-catalog proteins for multiple different research areas, allowing you to easily find the proteins that you need.</li> <li><strong>Multiple Host Expression Systems, Tags, and Labels</strong>: Our proteins are produced in a variety of host expression systems and are either untagged or include a biotin, Fc, or His tag, or a fluorescent label to meet different experimental needs.</li> <li><strong>Seamless Transition from RUO to GMP</strong>: Our Animal-free and GMP-grade proteins frequently originate from the same clone, sequence, and expression system as our traditional research-grade proteins, making the transition from basic research into process development and clinical manufacturing as efficient and seamless as possible.</li> <li><strong>Bulk Proteins at Discounted Prices</strong>: We have the capacity and the expertise to scale up the production of any protein and we offer economical pricing on bulk orders.</li> <li><strong>Custom Protein Capabilities</strong>: If you don’t see the protein that you need on our website, we offer custom protein services. From scratch protein development to customizing a protein from our catalog, our custom services team will work with you to create the product that fits your experimental needs.</li> <li><strong>Custom Bottling Options: </strong>If your research requires a special formulation or size, custom bottling options are available.</li> <li><strong>Expert Customer Support Assistance</strong>: Almost all of our proteins are manufactured in-house, allowing us to maintain complete control over the quality of our products. If you have any questions about our products, our protein scientists and highly trained technical service team are always available to assist you.</li> </ul></div> </div> </div> </div> </div> <div> <div class="paragraph paragraph--type--freeform mb-4 paragraph--view-mode--default"> <div><p><a name="featured"></a></p></div> </div> </div> <div> <div class="paragraph paragraph--type--header"> <div> <div><h2>Featured Protein Products</h2></div> </div> </div> </div> <div> <div class="paragraph paragraph--type--card-paragraph paragraph--view-mode--default card-para-default"> <div class="row card_row"> <div class="col-md-4"> <div class="h-100"> <div class="bg-white border rounded flex-column d-flex h-100"> <a href="/reagents/proteins/avi-tag-proteins" > <div class="card-img-top text-center mb-3" style="background-repeat: no-repeat; background-color: #f5f5f5; height:200px; width: 100%;"> <div class="teaser-valign-container" style=""> <div class="valign"> <img src="https://resources.bio-techne.com/bio-techne-assets/images/research-areas/new-av-tag-protein.png" alt="New Avi-Tag Graphic" loading="lazy" > </div> </div> </div> </a> <a class="card_title_link" href="/reagents/proteins/avi-tag-proteins" > <h3 class="card_title_htag"> <div><h3>Avi-tag and Amine-Labeled Biotinylated Proteins</h3></div> </h3> </a> <div class="card_description flex-grow-1"> <div><p>Biotinylated proteins can be powerful tools for assessing protein-protein interactions or screening antibody or small molecule libraries for potential therapeutics. Our products provide the performance and consistency needed to advance your drug discovery research.</p></div> </div> <div class="card-bottom-link"> <div> <a href="/reagents/proteins/avi-tag-proteins" > Explore Biotinylated Proteins </a> </div> </div> </div> </div> </div> <div class="col-md-4"> <div class="h-100"> <div class="bg-white border rounded flex-column d-flex h-100"> <a href="/search?keywords=cytokinegrowthfact&category_attr=Proteins%20and%20Enzymes" > <div class="card-img-top text-center mb-3" style="background-repeat: no-repeat; background-color: #f5f5f5; height:200px; width: 100%;"> <div class="teaser-valign-container" style=""> <div class="valign"> <img src="https://resources.bio-techne.com/bio-techne-assets/images/research-areas/immuno-cytokine-product-family.png" alt="Cytokine release from immune cell 250x250" loading="lazy" > </div> </div> </div> </a> <a class="card_title_link" href="/search?keywords=cytokinegrowthfact&category_attr=Proteins%20and%20Enzymes" > <h3 class="card_title_htag"> <div><h3>Cytokines and Growth Factors</h3></div> </h3> </a> <div class="card_description flex-grow-1"> <div><p>Achieve optimal cell culture conditions with R&D Systems<sup>TM</sup> cytokines and growth factors. Our stringent production and purification standards ensure that our products will deliver superior performance and consistent results.</p></div> </div> <div class="card-bottom-link"> <div> <a href="/search?keywords=cytokinegrowthfact&category_attr=Proteins%20and%20Enzymes" > Browse Cytokines and Growth Factors </a> </div> </div> </div> </div> </div> <div class="col-md-4"> <div class="h-100"> <div class="bg-white border rounded flex-column d-flex h-100"> <a href="/reagents/proteins/animal-free-proteins" > <div class="card-img-top text-center mb-3" style="background-repeat: no-repeat; background-color: #f5f5f5; height:200px; width: 100%;"> <div class="teaser-valign-container" style=""> <div class="valign"> <img src="https://resources.bio-techne.com/bio-techne-assets/images/research-areas/animal-free-vitronectin-frontimg-v2.png" alt="IL-2 protein ribbon structure" loading="lazy" > </div> </div> </div> </a> <a class="card_title_link" href="/reagents/proteins/animal-free-proteins" > <h3 class="card_title_htag"> <div><h3>Animal-Free Preclinical Proteins</h3></div> </h3> </a> <div class="card_description flex-grow-1"> <div><p>Save time and resources by starting your preclinical studies with Animal-free proteins. We utilize identical systems to manufacture our Animal-free and GMP-grade proteins, ensuring a seamless transition into clinical manufacturing.</p></div> </div> <div class="card-bottom-link"> <div> <a href="/reagents/proteins/animal-free-proteins" > Discover Animal-Free Proteins </a> </div> </div> </div> </div> </div> </div> </div> </div> <div> <section class="paragraph paragraph--type--full-width-banner-with-image mb-4 paragraph--view-mode--default paragraph-background-color--"> <div class="banner_background_image" data-bgimage="https://resources.bio-techne.com/bio-techne-assets/images/products/propak-hero-bg.jpg" style="background-repeat: no-repeat;"> <div> <div> <div> <div class="paragraph paragraph--type--_-2-text-to-media mb-4 paragraph--view-mode--default"> <div class="container-fluid container-wide"> <div class="layout layout--twocol-section layout--twocol-section--50-50"> <div class="layout__region layout__region--first"> <div class="hero-content-wrap"> <div class="field_block:paragraph:2_2_text_to_media:field_header_2_global"> <div><h2>Featured Literature: IL-2 Heat Stable Agonist Protein Application Note</h2></div> </div> <div class="field_block:paragraph:2_2_text_to_media:field_lg_sngl_frmtd_text_global"> <div><p>Explore the benefits of culturing your T cells or tumor-infiltrating lymphocytes (TILs) with our new IL-2 Heat Stable Agonist Protein. Engineered using artificial intelligence (AI), this protein has enhanced stability, enabling it to withstand high temperatures and extended culture durations.</p></div> </div> <div class="field_block:paragraph:2_2_text_to_media:field_call_to_action_global"> <a href="/resources/literature/development-of-il2-heat-stable-agonist-protein-using-artificial-intelligence" class="btn btn-primary" type="link"> Download the Application Note </a> </div> </div> </div> <div class="layout__region layout__region--second"> <div class="hero-content-wrap"> <div class="field_block:paragraph:2_2_text_to_media:field_indv_media"> <div> <img src="https://resources.bio-techne.com/bio-techne-assets/images/products/aim-homepage-img-300.png" alt="IL-2 protein ribbon structure shown on top of a computer circuit board to depict modifications of the protein by artificial intelligence" loading="lazy" > </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </section> </div> <div> <div class="thin-banner banner_wrapper"> <div class="banner-light"> <div> <div><h2>Bulk Protein Quantities Are Available at Discounted Prices</h2></div> <a href="/services/custom-protein-services/bulk-protein-reagents" > <button type="button" class="btn btn-primary"> Request a Bulk Quote </button> </a> </div> </div> </div> </div> <div> <div class="paragraph paragraph--type--freeform mb-4 paragraph--view-mode--default"> <div><p><a name="competitor"></a></p></div> </div> </div> <div> <div class="paragraph paragraph--type--header"> <div> <div><h2>Proteins by Application or Research Area</h2></div> </div> </div> </div> <div> <div class="paragraph paragraph--type--freeform mb-4 paragraph--view-mode--default"> <div><figure class="responsive-figure-table"><table class="overflow-auto table table-bordered"> <tbody> <tr> <td><a href="/reagents/proteins/immune-cell-culture-proteins">Immune Cell Culture</a></td> <td><a href="/reagents/proteins/stem-cell-proteins">Stem Cell Culture</a></td> <td><a href="/reagents/proteins/organoid-culture-proteins">Organoid Culture</a></td> </tr> <tr> <td><a href="/research-areas/coronavirus/proteins">Coronavirus Proteins</a></td> <td><a href="/reagents/proteins/immune-checkpoint-proteins">Immune Checkpoint Proteins</a></td> <td><a href="/reagents/proteins/cytokines">Cytokines & Receptors</a></td> </tr> <tr> <td><a href="/reagents/proteins/growth-factors">Growth Factors</a></td> <td><a href="/gmp-products/gmp-proteins">Cell Therapy Manufacturing</a></td> <td><a href="/reagents/enzymes">Enzymes</a></td> </tr> </tbody> </table></figure> <p> </p></div> </div> </div> <div> <section class="paragraph paragraph--type--full-width-banner-with-image mb-4 paragraph--view-mode--default paragraph-background-color--dark"> <div class="banner_background_image" data-bgimage="https://resources.bio-techne.com/bio-techne-assets/images/research-areas/v19_fluorokines-banner-bg.png" style="background-repeat: no-repeat;"> <div> <div> <div> <div class="paragraph paragraph--type--_-2-text-to-media mb-4 paragraph--view-mode--default"> <div class="container-fluid container-wide"> <div class="layout layout--twocol-section layout--twocol-section--50-50"> <div class="layout__region layout__region--first"> <div class="hero-content-wrap"> <div class="field_block:paragraph:2_2_text_to_media:field_header_2_global"> <div><h2>Fluorokines™ Fluorescent-Labeled Proteins</h2></div> </div> <div class="field_block:paragraph:2_2_text_to_media:field_lg_sngl_frmtd_text_global"> <div><p>Utilize our wide selection of fluorescent-labeled proteins to evaluate CAR expression on CAR-T or CAR-NK cells, detect immune checkpoint receptors, or identify SARS-CoV-2-responsive cells. Fluorokines are highly specific and allow target molecules to be directly stained and detected by flow cytometry. </p></div> </div> <div class="field_block:paragraph:2_2_text_to_media:field_call_to_action_global"> <a href="/research-products/reagents-kits/proteins/fluorokines-fluorescent-labeled-proteins" class="btn btn-primary" type="link"> Learn More </a> </div> </div> </div> <div class="layout__region layout__region--second"> <div class="hero-content-wrap"> <div class="field_block:paragraph:2_2_text_to_media:field_indv_media"> <div> <img src="https://resources.bio-techne.com/bio-techne-assets/images/research-areas/flurokine-teaser-card.png" alt="Fluorokine teaser card" loading="lazy" > </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </section> </div> <div> <div class="paragraph paragraph--type--freeform mb-4 paragraph--view-mode--default"> <div><p><a name="testimonials"></a></p> <p> </p></div> </div> </div> <div> <div class="testimonial"> <div > <div class="row"> <div class="col-md-4"> <div class="left-title"> <h2>Customer Success Stories</h2> </div> </div> <div class="col-md-8"> <div class="right-card bg-white border rounded p-5 mb-4"> <div class="carousel slide" id="carouselIndicators" data-ride="carousel"> <div class="row"> <div class="col-md-12"> <div class="carousel-inner"> <div class="carousel-item active">  <div class="paragraph paragraph--type--individual-testimonial individual-testimonial paragraph--view-mode--default"> <div class="testimonial-info-group"> <div class="row"> <div class="col-lg-3 offset-lg-1 col-sm-12"> <div class="text-center text-lg-left"> <div class="individual-testimonial__headshot"> <div class="blazy blazy--field blazy--field-indv-img blazy--field-indv-img--default" data-blazy=""> <div data-b-token="b-8a87f052e21" class="media media--blazy media--rendered media--resourcesbio-techne media--bundle--remote-image"><img src='https://resources.bio-techne.com/bio-techne-assets/images/research-areas/v4_DeborahFrench.png' alt='Deborah French Headshot'> </div> </div> </div> </div> </div> <div class="col-10 offset-1 col-sm-10 offset-sm-1 col-md-8 offset-md-2 col-lg-6 offset-lg-0"> <div class="testimonial-info"> <div class="individual-testimonial__info"> <span class="individual-testimonial__name"> Deborah French </span><br/> <span class="individual-testimonial__position"> Pluripotent Stem Cell Core Children's Hospital of Phila. </span><br/> </div> </div> </div> <div class="col-12 col-sm-12 col-md-12 col-lg-2 quote-column text-center"> <img class="quote" loading="lazy" src="/themes/custom/bio_techne_global/images/testimonials-quote.svg"/> </div> </div> </div> <div class="row"> <div class="col-10 offset-1 col-md-10 offset-md-1 col-sm-10"> <div class="individual-testimonial__testimonial"> The Bio-Techne products that we're using, we love, and what we're using are cytokines, growth factors and we have been using them since the beginning. I mean, our core started in 2008 and we really have not changed.  </div> </div> </div> </div> </div> <div class="carousel-item">  <div class="paragraph paragraph--type--individual-testimonial individual-testimonial paragraph--view-mode--default"> <div class="testimonial-info-group"> <div class="row"> <div class="col-lg-3 offset-lg-1 col-sm-12"> <div class="text-center text-lg-left"> <div class="individual-testimonial__headshot"> <div class="blazy blazy--field blazy--field-indv-img blazy--field-indv-img--default" data-blazy=""> <div data-b-token="b-d46258311b3" class="media media--blazy media--rendered media--resourcesbio-techne media--bundle--remote-image"><img src='https://resources.bio-techne.com/bio-techne-assets/images/research-areas/v2_BarbaraCorneo.png' alt='Barbara Corneo Headshot'> </div> </div> </div> </div> </div> <div class="col-10 offset-1 col-sm-10 offset-sm-1 col-md-8 offset-md-2 col-lg-6 offset-lg-0"> <div class="testimonial-info"> <div class="individual-testimonial__info"> <span class="individual-testimonial__name"> Barbara Corneo </span><br/> <span class="individual-testimonial__position"> Stem Cell Core Facility | Columbia University Medical School </span><br/> </div> </div> </div> <div class="col-12 col-sm-12 col-md-12 col-lg-2 quote-column text-center"> <img class="quote" loading="lazy" src="/themes/custom/bio_techne_global/images/testimonials-quote.svg"/> </div> </div> </div> <div class="row"> <div class="col-10 offset-1 col-md-10 offset-md-1 col-sm-10"> <div class="individual-testimonial__testimonial"> So in our stem cell core facility, we do a lot of differentiation into different progenies. For all this differentiation we use a number of different cytokines, growth factors and we buy them all from R&D Systems or Tocris. </div> </div> </div> </div> </div> <div class="carousel-item">  <div class="paragraph paragraph--type--individual-testimonial individual-testimonial paragraph--view-mode--default"> <div class="testimonial-info-group"> <div class="row"> <div class="col-lg-3 offset-lg-1 col-sm-12"> <div class="text-center text-lg-left"> <div class="individual-testimonial__headshot"> <div class="blazy blazy--field blazy--field-indv-img blazy--field-indv-img--default" data-blazy=""> <div data-b-token="b-a6066895518" class="media media--blazy media--rendered media--resourcesbio-techne media--bundle--remote-image"><img src='https://resources.bio-techne.com/bio-techne-assets/images/research-areas/v2_WenliYang.png' alt='Wenli Yang Headshot'> </div> </div> </div> </div> </div> <div class="col-10 offset-1 col-sm-10 offset-sm-1 col-md-8 offset-md-2 col-lg-6 offset-lg-0"> <div class="testimonial-info"> <div class="individual-testimonial__info"> <span class="individual-testimonial__name"> Wenli Yang </span><br/> <span class="individual-testimonial__position"> iPSC Core Facility | University of Pennsylvania </span><br/> </div> </div> </div> <div class="col-12 col-sm-12 col-md-12 col-lg-2 quote-column text-center"> <img class="quote" loading="lazy" src="/themes/custom/bio_techne_global/images/testimonials-quote.svg"/> </div> </div> </div> <div class="row"> <div class="col-10 offset-1 col-md-10 offset-md-1 col-sm-10"> <div class="individual-testimonial__testimonial"> We had very good experience with R&D cytokines as well as antibodies. We didn't find any lot-to-lot variation with the cytokines and antibodies so, in general, we're very pleased. </div> </div> </div> </div> </div> </div> </div> </div> <div class="row"> <div class="col-md-12"> <ol class="carousel-indicators"> <li data-target="#carouselIndicators" data-slide-to="0" class="active"> </li> <li data-target="#carouselIndicators" data-slide-to="1"> </li> <li data-target="#carouselIndicators" data-slide-to="2"> </li> </ol> </div> </div> <a class="carousel-control-prev" href="#carouselIndicators" role="button" data-slide="prev"> <span class="carousel-control-prev-icon" aria-hidden="true"></span> <span class="sr-only">Previous</span> </a> <a class="carousel-control-next" href="#carouselIndicators" role="button" data-slide="next"> <span class="carousel-control-next-icon" aria-hidden="true"></span> <span class="sr-only">Next</span> </a> </div> </div> </div> </div> </div> </div> <div> <div class="paragraph paragraph--type--freeform mb-4 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From scratch protein development to customizing a protein from our catalog, our experienced custom protein services team will work with you to create the protein that fits your experimental needs.</p></div> </div> <div class="field_block:paragraph:2_2_media_to_text:field_call_to_action_global"> <a href="/services/custom-protein-services" class="btn btn-primary" type="link"> Contact Our Team </a> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </section> </div> <div> <div class="paragraph paragraph--type--freeform mb-4 paragraph--view-mode--default"> <div><p><a name="background"></a></p></div> </div> </div> <div> <div class="paragraph paragraph--type--background-information mb-4 paragraph--view-mode--default"> <div class="row"> <div class="col"> <div> <h3>Background Information </h3> </div> <div> <div id="accordion" class="paragraph paragraph--type--background-about paragraph--view-mode--default"> <div class="card-header rounded-top bg-white"> <a class="collapsed" data-toggle="collapse" href="#aboutPara-rampd-systems-commitment-to-protein-quality9" role="button" aria-expanded="false" aria-controls="aboutContents"> <h5>R&D Systems Commitment to Protein Quality</h5> </a> </div> <div class="collapse" id="aboutPara-rampd-systems-commitment-to-protein-quality9" aria-expanded="false" aria-controls="aboutContents"> <div class="card-body"> <div> <div> <div class="paragraph paragraph--type--freeform mb-4 paragraph--view-mode--default"> <div><h3>R&D Systems: The Most Trusted Source for Recombinant Proteins</h3> <p>Bio-Techne offers more than 5,000 R&D Systems<sup>®</sup> recombinant proteins for a variety of different research areas including immunology, cancer, development, neuroscience, and stem cells. With over 30 years of experience, R&D Systems’ rigorous in-house testing and quality control specifications ensure that our recombinant proteins will provide industry-leading bioactivity and purity, lot-to-lot consistency, and low endotoxin levels. As more than 95% of the proteins in our catalog are manufactured in-house, we maintain complete control over the quality of our products and the satisfaction of our customers, which is our number one priority.</p> <p>To guarantee that each protein meets our customers’ high standards, we fully assess and report the specifications of each protein on our datasheets, including the activity, endotoxin level, and purity. The bioactivities of our proteins are assessed using a variety of different assays depending on the protein being tested. These include cell proliferation, chemotaxis, or cytokine secretion assays, enzymatic assays, functional ELISAs, and surface plasmon resonance (SPR). N-terminal sequence analysis is also performed for each recombinant protein to confirm that the protein produced matches the expected sequence, and the bioactivity and physical state of our proteins are monitored over long periods of time. Freeze/thaw cycles are carried out to ensure that the buffer provides for long-term stability. Additionally, we evaluate lot-to-lot consistency so that researchers don’t have to worry about whether or not their experiments will be reproducible over time. Multiple lots with matching specifications are created for all new proteins and each new lot is tested side-by-side with previous lots to ensure that the new lots display the same level of bioactivity and purity as the previous lots. Each new lot is also tested to make sure that it meets our expectations for endotoxin specifications, which is an industry-leading  <0.1 EU/µg. Finally, all of our recombinant proteins are specially formulated for the best stability and are lyophilized from a sterile filtered solution. If our documentation fails to address any questions that you may have about our products, our protein scientists and highly trained technical service team at R&D Systems are always available to assist you.</p> <p>Our catalog includes recombinant proteins for multiple different species, that are either untagged or have a biotin, Fc, or His tag.  We also offer an expanding line of Avi-tag biotinylated proteins. Our standard recombinant proteins are available without or with a carrier protein, which is typically bovine serum albumin (BSA) at a concentration of 50 µg BSA per 1 µg of protein. The presence of the carrier protein gives the lyophilized protein greater stability, maximizes recovery upon reconstitution, and allows easy handling and storage. 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