{"id":1998,"date":"2026-06-28T16:13:42","date_gmt":"2026-06-28T15:13:42","guid":{"rendered":"http:\/\/seamlessbio.de\/?page_id=1998"},"modified":"2026-06-28T16:15:44","modified_gmt":"2026-06-28T15:15:44","slug":"human-serum-male","status":"publish","type":"page","link":"https:\/\/seamlessbio.de\/de\/human-serum-male\/","title":{"rendered":"Human Serum \u2014 Male Donors"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"1998\" class=\"elementor elementor-1998\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-43d4ee8 e-con e-atomic-element e-flexbox-base e-bb27443 \" data-id=\"43d4ee8\" data-element_type=\"e-flexbox\" data-e-type=\"e-flexbox\" data-interaction-id=\"43d4ee8\">\n    \t\t<div class=\"elementor-element elementor-element-fd6b56c elementor-widget elementor-widget-html\" data-id=\"fd6b56c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<!--\nYOAST SEO \u2014 seamlessbio.de\nSlug:        \/products\/human-sera-plasma-and-more\/human-serum-male\/\nFocus KW:    human serum male donors cell culture\nSEO Title:   Human Serum Male | MHC\/HLA Antibody-Free | SeamlessBio\nMeta Desc:   Human Serum from male donors only \u2014 free of MHC\/HLA alloantibodies generated during pregnancy. Essential for T-cell assays, mixed lymphocyte reactions, immunology and antigen-specific cell culture. EU & US origin. SeamlessBio.\nBreadcrumb:  Home \u203a Products \u203a Human Sera & Plasma \u203a Human Serum Male\n-->\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"BreadcrumbList\",\n      \"itemListElement\": [\n        { \"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/www.seamlessbio.de\/\" },\n        { \"@type\": \"ListItem\", \"position\": 2, \"name\": \"Products\", \"item\": \"https:\/\/www.seamlessbio.de\/products\/\" },\n        { \"@type\": \"ListItem\", \"position\": 3, \"name\": \"Human Sera & Plasma\", \"item\": \"https:\/\/www.seamlessbio.de\/products\/human-sera-plasma-and-more\/\" },\n        { \"@type\": \"ListItem\", \"position\": 4, \"name\": \"Human Serum Male\", \"item\": \"https:\/\/www.seamlessbio.de\/products\/human-sera-plasma-and-more\/human-serum-male\/\" }\n      ]\n    },\n    {\n      \"@type\": \"Product\",\n      \"name\": \"Human Serum \u2014 Male Donors\",\n      \"brand\": { \"@type\": \"Brand\", \"name\": \"SeamlessBio\" },\n      \"description\": \"Human serum collected exclusively from male donors. Free of MHC class I and class II alloantibodies that can be generated in parous female donors. Essential for antigen-specific T-cell assays, mixed lymphocyte reactions and immunological research requiring a low-background human serum matrix.\",\n      \"offers\": {\n        \"@type\": \"Offer\",\n        \"url\": \"https:\/\/www.seamlessbio.de\/about-us\/contact-imprint\/\",\n        \"availability\": \"https:\/\/schema.org\/InStock\",\n        \"priceCurrency\": \"EUR\"\n      },\n      \"additionalProperty\": [\n        { \"@type\": \"PropertyValue\", \"name\": \"Donor sex\", \"value\": \"Male only\" },\n        { \"@type\": \"PropertyValue\", \"name\": \"MHC\/HLA antibodies\", \"value\": \"Absent (male donors, never pregnant)\" },\n        { \"@type\": \"PropertyValue\", \"name\": \"Sterility\", \"value\": \"0.2 \u00b5m sterile filtered\" },\n        { \"@type\": \"PropertyValue\", \"name\": \"Regulatory status\", \"value\": \"For research use only\" }\n      ]\n    },\n    {\n      \"@type\": \"FAQPage\",\n      \"mainEntity\": [\n        {\n          \"@type\": \"Question\",\n          \"name\": \"Why use human serum from male donors specifically?\",\n          \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"Female donors who have been pregnant can develop alloantibodies against MHC class I and class II antigens carried on fetal and paternal cells. These HLA alloantibodies can interfere with antigen-specific T-cell assays, mixed lymphocyte reactions and immunological readouts. Male donor serum is free of pregnancy-induced HLA alloantibodies, providing a cleaner background for antigen-driven cellular assays.\" }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"What is the difference between Human Serum Male and Human Serum Type AB Male?\",\n          \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"Human Serum Male is collected from male donors of any blood type. Human Serum Type AB Male adds the additional constraint that donors must be blood group AB \u2014 meaning the serum contains neither anti-A nor anti-B antibodies. Type AB Male is the cleanest option for use with human cells of any blood type and is preferred for CAR-T and ATMP manufacturing.\" }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"Can Human Serum Male replace FBS in T-cell assays?\",\n          \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"Yes \u2014 and in many T-cell and immunological assays it is superior to FBS. FBS contains bovine proteins that can be recognised by human immune cells as foreign antigens, introducing non-specific background activation. Human male serum provides a physiologically relevant xeno-free matrix without the HLA alloantibody interference associated with mixed-gender or parous female serum.\" }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"At what concentration is Human Serum Male used in cell culture?\",\n          \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"Typical working concentrations are 2\u201310% depending on the application. For antigen-specific T-cell assays and MLR, 5\u201310% is standard. For activation assays where cytokine-driven signals must be preserved, lower concentrations (2\u20135%) are used to avoid over-supplementation that can dampen receptor signalling.\" }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"Is Human Serum Male available heat inactivated?\",\n          \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"Yes. Heat inactivated (56\u00b0C, 30 min) Human Serum Male is available on request. Heat inactivation eliminates complement activity, which can be desirable for hematopoietic cell culture and immunological assays sensitive to complement-mediated lysis. Non-heat-inactivated is standard and preferred when complement activity is not detrimental.\" }\n        }\n      ]\n    }\n  ]\n}\n<\/script>\n\n<section class=\"sb-hsm-page\">\n<div class=\"sb-hsm-container\">\n\n  <nav class=\"sb-hsm-bc\">\n    <a href=\"https:\/\/www.seamlessbio.de\/\">Home<\/a><span>\/<\/span>\n    <a href=\"https:\/\/www.seamlessbio.de\/products\/human-sera-plasma-and-more\/\">Human Sera & Plasma<\/a><span>\/<\/span>\n    <strong>Human Serum Male<\/strong>\n  <\/nav>\n\n  <!-- HERO -->\n  <div class=\"sb-hsm-hero\">\n    <div class=\"sb-hsm-hero-text\">\n      <span class=\"sb-hsm-eyebrow\">Male Donors Only \u00b7 MHC\/HLA Antibody-Free \u00b7 EU & US Origin<\/span>\n      <h1>Human Serum \u2014 Male Donors<\/h1>\n      <p>Human serum collected exclusively from male donors \u2014 free of the MHC class I and class II alloantibodies that can be present in serum from parous female donors. The critical choice for antigen-specific T-cell assays, mixed lymphocyte reactions and immunological research where a clean, low-background human serum matrix is required.<\/p>\n      <div class=\"sb-hsm-hero-tags\">\n        <span>Male Donors Only<\/span>\n        <span>HLA Antibody-Free<\/span>\n        <span>T-Cell Assays<\/span>\n        <span>MLR<\/span>\n        <span>Immunology Research<\/span>\n      <\/div>\n      <div class=\"sb-hsm-hero-btns\">\n        <a href=\"https:\/\/www.seamlessbio.de\/about-us\/contact-imprint\/\" class=\"sb-hsm-btn\">Request Quote \/ Sample<\/a>\n        <a href=\"https:\/\/shop.seamlessbio.de\" class=\"sb-hsm-btn-outline\">Order in Shop<\/a>\n      <\/div>\n    <\/div>\n    <div class=\"sb-hsm-hero-image\">\n      <img decoding=\"async\" src=\"https:\/\/www.seamlessbio.de\/wp-content\/uploads\/2026\/06\/human-serum-male-seamlessbio.png\"\n           alt=\"Human Serum Male Donors, SeamlessBio\"\n           onerror=\"this.style.display='none'; this.nextElementSibling.style.display='flex';\">\n      <div class=\"sb-hsm-img-fallback\" style=\"display:none;\">Product image placeholder<\/div>\n    <\/div>\n  <\/div>\n\n  <!-- KEY FACTS -->\n  <div class=\"sb-hsm-facts\">\n    <div class=\"sb-hsm-fact\">\n      <span class=\"sb-hsm-fact-n\">Male only<\/span>\n      <span>Exclusively male donors \u2014 no parous female donors in pool<\/span>\n    <\/div>\n    <div class=\"sb-hsm-fact\">\n      <span class=\"sb-hsm-fact-n\">HLA-free<\/span>\n      <span>No pregnancy-induced MHC class I\/II alloantibodies<\/span>\n    <\/div>\n    <div class=\"sb-hsm-fact\">\n      <span class=\"sb-hsm-fact-n\">0.2 \u00b5m<\/span>\n      <span>Sterile filtered \u2014 mycoplasma and endotoxin tested per lot<\/span>\n    <\/div>\n    <div class=\"sb-hsm-fact\">\n      <span class=\"sb-hsm-fact-n\">EU + US<\/span>\n      <span>Multiple origins available \u2014 full CoA, CoO, donor screening documentation<\/span>\n    <\/div>\n  <\/div>\n\n  <!-- SCIENTIFIC RATIONALE -->\n  <div class=\"sb-hsm-section\">\n    <h2>Why Male Donor Serum Matters \u2014 The Science<\/h2>\n    <div class=\"sb-hsm-two-col\">\n      <div class=\"sb-hsm-text\">\n        <h3>The HLA Alloantibody Problem in Female Donor Serum<\/h3>\n        <p>Human serum from mixed-gender donor pools contains serum from both male and female donors. While male donors produce minimal HLA alloantibodies in the absence of transfusion or transplantation, female donors who have experienced pregnancy are a significant source of HLA-reactive antibodies in pooled serum preparations.<\/p>\n        <p>During pregnancy, the maternal immune system is exposed to paternal HLA antigens expressed on fetal cells that cross the placenta. This exposure can trigger the development of alloantibodies against both MHC class I (HLA-A, -B, -C) and MHC class II (HLA-DR, -DP, -DQ) antigens. These antibodies persist in the circulation long after delivery and are present in the serum of parous female donors at the time of blood collection.<\/p>\n        <p>In cell culture applications that depend on antigen-specific T-cell responses \u2014 mixed lymphocyte reactions (MLR), ELISPOT assays, HLA typing, cytotoxicity assays and immunological mechanistic studies \u2014 the presence of HLA alloantibodies in the serum matrix can:<\/p>\n        <ul class=\"sb-hsm-ul\">\n          <li>Compete with T-cell receptor binding at HLA-peptide complexes<\/li>\n          <li>Block antigen-driven T-cell activation signals<\/li>\n          <li>Trigger non-specific complement-mediated cytotoxicity<\/li>\n          <li>Interfere with NK cell recognition of HLA class I<\/li>\n          <li>Introduce inter-lot variability linked to donor alloantibody titre variation<\/li>\n        <\/ul>\n        <h3>Why Male-Only Serum Solves This<\/h3>\n        <p>Male donors who have not received blood transfusions have minimal exposure to allogeneic HLA antigens and do not develop significant HLA alloantibody titres. Serum collected exclusively from male donors is therefore reliably free of the pregnancy-induced alloantibodies that complicate immunological assays \u2014 providing a reproducible, low-background matrix for antigen-specific studies.<\/p>\n        <p>This is the reason why leading T-cell immunology laboratories, transplant research groups and CAR-T manufacturers specifically require male-only serum for assay development and manufacturing processes.<\/p>\n      <\/div>\n      <div class=\"sb-hsm-side\">\n        <div class=\"sb-hsm-comparison\">\n          <h3>Female vs. Male Donor Serum at a Glance<\/h3>\n          <table class=\"sb-hsm-cmp\">\n            <thead>\n              <tr><th>Property<\/th><th>Male Donor<\/th><th>Mixed \/ Female Donor<\/th><\/tr>\n            <\/thead>\n            <tbody>\n              <tr><td>MHC class I alloantibodies<\/td><td>Absent<\/td><td>Variable \u2014 may be present<\/td><\/tr>\n              <tr><td>MHC class II alloantibodies<\/td><td>Absent<\/td><td>Present in parous donors<\/td><\/tr>\n              <tr><td>Anti-A \/ Anti-B antibodies<\/td><td>Variable (blood type)<\/td><td>Variable (blood type)<\/td><\/tr>\n              <tr><td>Complement activity<\/td><td>Present (non-HI)<\/td><td>Present (non-HI)<\/td><\/tr>\n              <tr><td>MLR background<\/td><td>Low<\/td><td>Potentially elevated<\/td><\/tr>\n              <tr><td>Antigen-specific T-cell assays<\/td><td>Reliable<\/td><td>Risk of signal suppression<\/td><\/tr>\n              <tr><td>Lot-to-lot consistency<\/td><td>High<\/td><td>Variable<\/td><\/tr>\n            <\/tbody>\n          <\/table>\n        <\/div>\n\n        <div class=\"sb-hsm-ref-box\">\n          <h3>Scientific Reference<\/h3>\n          <p>The use of male-only human serum for T-cell immunological assays is well established in the research community. As noted on ResearchGate by immunologists working with antigen-specific assays: <em>\"We use serum from males because women who have had children generate antibodies to the child's allogeneic class II, which can block antigen-driven responses.\"<\/em><\/p>\n          <p style=\"font-size:12px;color:#888;margin-top:8px\">ResearchGate, Human Serum vs. FBS discussion, immunology community consensus<\/p>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n\n  <!-- APPLICATIONS -->\n  <div class=\"sb-hsm-section sb-hsm-alt\">\n    <h2>Applications<\/h2>\n    <div class=\"sb-hsm-app-grid\">\n      <div class=\"sb-hsm-app\">\n        <h3>Mixed Lymphocyte Reaction (MLR)<\/h3>\n        <p>The gold-standard assay for measuring alloreactive T-cell responses. Male donor serum is essential \u2014 HLA alloantibodies from parous female donors directly compete with the alloreactive T-cell receptor engagement being measured, generating false-negative or suppressed readouts.<\/p>\n      <\/div>\n      <div class=\"sb-hsm-app\">\n        <h3>Antigen-Specific T-Cell Assays (ELISPOT, ICS)<\/h3>\n        <p>Intracellular cytokine staining (ICS), ELISPOT and peptide-MHC tetramer assays all rely on HLA-restricted T-cell recognition. Serum HLA alloantibodies can mask peptide-MHC complexes on antigen-presenting cells, reducing assay sensitivity. Male serum eliminates this confounder.<\/p>\n      <\/div>\n      <div class=\"sb-hsm-app\">\n        <h3>CAR-T & Adoptive T-Cell Therapy Manufacturing<\/h3>\n        <p>Human Serum Male provides a xeno-free T-cell expansion supplement without the HLA alloantibody risk of mixed-gender serum. Used at 2\u20135% in activation and expansion protocols. For the cleanest option, combine with Type AB blood group donors \u2014 see Human Serum Type AB Male.<\/p>\n      <\/div>\n      <div class=\"sb-hsm-app\">\n        <h3>NK Cell Functional Assays<\/h3>\n        <p>NK cells recognise and kill cells with low or absent HLA class I expression. Anti-HLA antibodies in female donor serum can alter NK cell activation thresholds by opsonising target cells. Male serum provides a neutral matrix for NK cell cytotoxicity and ADCC assays.<\/p>\n      <\/div>\n      <div class=\"sb-hsm-app\">\n        <h3>HLA Typing & Transplant Research<\/h3>\n        <p>HLA antibody detection and crossmatch assays require serum samples free of pre-formed alloantibodies as negative controls or assay matrix. Male donor serum is the standard negative-control matrix for complement-dependent cytotoxicity (CDC) crossmatch assays in transplant immunology.<\/p>\n      <\/div>\n      <div class=\"sb-hsm-app\">\n        <h3>Primary Human Immune Cell Culture<\/h3>\n        <p>Culture of PBMCs, dendritic cells, macrophages and B cells in a physiologically relevant matrix. Male serum provides human-matched growth support without xenogenic proteins (FBS) or HLA interference, maintaining basal immune cell activation at baseline levels.<\/p>\n      <\/div>\n    <\/div>\n  <\/div>\n\n  <!-- PRODUCT INFO -->\n  <div class=\"sb-hsm-section\">\n    <h2>Product Information<\/h2>\n    <table class=\"sb-hsm-info\">\n      <tr><td>Product type<\/td><td>Human Serum \u2014 Male Donors<\/td><\/tr>\n      <tr><td>Donor selection<\/td><td>Exclusively male donors \u2014 no parous female donors<\/td><\/tr>\n      <tr><td>Blood type<\/td><td>Mixed blood types (pooled) \u2014 for AB-only, see Human Serum Type AB Male<\/td><\/tr>\n      <tr><td>Collection method<\/td><td>Off-the-clot (OTC) \u2014 natural clotting from whole blood<\/td><\/tr>\n      <tr><td>Filtration<\/td><td>0.2 \u00b5m sterile filtered<\/td><\/tr>\n      <tr><td>Endotoxin<\/td><td>Tested per lot \u2014 LAL method<\/td><\/tr>\n      <tr><td>Mycoplasma<\/td><td>Tested \u2014 negative<\/td><\/tr>\n      <tr><td>Viral screening<\/td><td>HBsAg, HCV, HIV-1\/2, West Nile Virus, Syphilis \u2014 negative per FDA\/EMA requirements<\/td><\/tr>\n      <tr><td>Heat inactivation<\/td><td>Available on request (56\u00b0C, 30 min)<\/td><\/tr>\n      <tr><td>Origin<\/td><td>EU (Germany\/France\/Netherlands) \u00b7 US \u2014 specify on order<\/td><\/tr>\n      <tr><td>Volumes<\/td><td>10 mL, 50 mL, 100 mL, 500 mL \u00b7 Bulk on request<\/td><\/tr>\n      <tr><td>Storage<\/td><td>\u221220\u00b0C \u00b7 Batch reservation available<\/td><\/tr>\n      <tr><td>Documentation<\/td><td>CoA, CoO, SDS, Donor Screening Report, TSE\/BSE Statement<\/td><\/tr>\n      <tr><td>Regulatory status<\/td><td>For research use only<\/td><\/tr>\n    <\/table>\n  <\/div>\n\n  <!-- VARIANTS -->\n  <div class=\"sb-hsm-section sb-hsm-alt\">\n    <h2>Human Serum Male \u2014 Which Variant?<\/h2>\n    <p class=\"sb-hsm-intro\">SeamlessBio offers four male-donor human serum variants. Choose based on your blood type requirement and application.<\/p>\n    <div class=\"sb-hsm-variant-grid\">\n      <div class=\"sb-hsm-variant sb-hsm-variant-active\">\n        <div class=\"sb-hsm-variant-badge\">This product<\/div>\n        <h3>Human Serum Male<\/h3>\n        <p>Male donors, mixed blood types (A, B, AB, O). Contains anti-A and\/or anti-B antibodies. Use when blood type compatibility is not critical \u2014 immunology research, non-cell-therapy applications.<\/p>\n      <\/div>\n      <a href=\"https:\/\/www.seamlessbio.de\/products\/human-sera-plasma-and-more\/human-serum-type-ab-male\/\" class=\"sb-hsm-variant sb-hsm-variant-link\">\n        <h3>Human Serum Type AB Male<\/h3>\n        <p>Male donors, blood type AB only. Free of anti-A and anti-B antibodies AND HLA alloantibodies. The cleanest option for ATMP manufacturing and human cell culture of any blood type.<\/p>\n        <span class=\"sb-hsm-variant-cta\">View product \u2192<\/span>\n      <\/a>\n      <a href=\"https:\/\/www.seamlessbio.de\/products\/human-sera-plasma-and-more\/human-serum-off-the-clot-type-ab\/\" class=\"sb-hsm-variant sb-hsm-variant-link\">\n        <h3>Human Serum OTC Type AB<\/h3>\n        <p>Mixed gender, blood type AB. Off-the-clot maximum growth factors. When HLA alloantibody risk is acceptable and blood type universality is the primary requirement.<\/p>\n        <span class=\"sb-hsm-variant-cta\">View product \u2192<\/span>\n      <\/a>\n      <a href=\"https:\/\/www.seamlessbio.de\/products\/human-sera-plasma-and-more\/human-serum\/\" class=\"sb-hsm-variant sb-hsm-variant-link\">\n        <h3>Human Serum Standard<\/h3>\n        <p>Mixed gender, mixed blood types. General purpose human serum for immunoassay matrix, blocking and non-antigen-specific cell culture applications.<\/p>\n        <span class=\"sb-hsm-variant-cta\">View product \u2192<\/span>\n      <\/a>\n    <\/div>\n  <\/div>\n\n  <!-- FAQ -->\n  <div class=\"sb-hsm-section\">\n    <h2>Frequently Asked Questions<\/h2>\n    <div class=\"sb-hsm-faqs\">\n      <div class=\"sb-hsm-faq\">\n        <h3>Why use human serum from male donors specifically?<\/h3>\n        <p>Female donors who have been pregnant develop alloantibodies against MHC class I and class II antigens on paternal and fetal cells. These HLA alloantibodies persist in serum and can interfere with antigen-specific T-cell assays, mixed lymphocyte reactions and NK cell assays. Male donor serum is free of pregnancy-induced HLA alloantibodies, providing a reproducible, low-background matrix for immunological research.<\/p>\n      <\/div>\n      <div class=\"sb-hsm-faq\">\n        <h3>What is the difference between Human Serum Male and Human Serum Type AB Male?<\/h3>\n        <p>Human Serum Male uses male donors of any blood type \u2014 it eliminates HLA alloantibodies but may still contain anti-A or anti-B antibodies depending on donor blood type distribution in the pool. Human Serum Type AB Male adds the requirement that donors must be blood group AB, eliminating both HLA alloantibodies and anti-A\/B antibodies simultaneously \u2014 the safest option for human cell culture of any blood type.<\/p>\n      <\/div>\n      <div class=\"sb-hsm-faq\">\n        <h3>Can Human Serum Male replace FBS in T-cell assays?<\/h3>\n        <p>Yes \u2014 and in antigen-specific T-cell assays it is superior. FBS contains bovine proteins that can trigger non-specific human T-cell responses, elevating background. Human male serum provides a xeno-free matrix without HLA interference, giving cleaner signal-to-noise in antigen-driven assays.<\/p>\n      <\/div>\n      <div class=\"sb-hsm-faq\">\n        <h3>Is heat inactivated Human Serum Male available?<\/h3>\n        <p>Yes, on request. Heat inactivation (56\u00b0C, 30 min) destroys complement activity, which is useful for hematopoietic cell culture and complement-sensitive immunological assays. Standard product ships non-heat-inactivated. Specify at order.<\/p>\n      <\/div>\n      <div class=\"sb-hsm-faq\">\n        <h3>What concentration should I use?<\/h3>\n        <p>Typical concentrations are 2\u201310%. For antigen-specific T-cell assays and MLR, 5\u201310% is standard. For activation assays where cytokine signalling must be preserved without over-supplementation, 2\u20135% is preferred. We recommend testing a range for your specific cell type and readout.<\/p>\n      <\/div>\n    <\/div>\n  <\/div>\n\n  <!-- RELATED -->\n  <div class=\"sb-hsm-section sb-hsm-alt\">\n    <h2>Related Products<\/h2>\n    <div class=\"sb-hsm-related\">\n      <a href=\"https:\/\/www.seamlessbio.de\/products\/human-sera-plasma-and-more\/human-serum-type-ab-male\/\" class=\"sb-hsm-rel\">\n        <h3>Human Serum Type AB Male<\/h3>\n        <p>Male donors, blood type AB \u2014 free of anti-A\/B AND HLA alloantibodies. Preferred for ATMP and CAR-T.<\/p>\n      <\/a>\n      <a href=\"https:\/\/www.seamlessbio.de\/products\/human-sera-plasma-and-more\/human-platelet-lysate-hpl\/\" class=\"sb-hsm-rel\">\n        <h3>Human Platelet Lysate (hPL)<\/h3>\n        <p>Xeno-free serum replacement for MSC expansion \u2014 growth factor-rich, GMP-ready.<\/p>\n      <\/a>\n      <a href=\"https:\/\/www.seamlessbio.de\/applications\/pbmc-immunology\/\" class=\"sb-hsm-rel\">\n        <h3>PBMC & Immunology Guide<\/h3>\n        <p>Complete application guide for PBMC isolation, culture and functional immunological assays.<\/p>\n      <\/a>\n      <a href=\"https:\/\/www.seamlessbio.de\/applications\/car-t-cell-manufacturing\/\" class=\"sb-hsm-rel\">\n        <h3>CAR-T Cell Manufacturing<\/h3>\n        <p>T-cell expansion protocols, media and serum requirements for CAR-T ATMP manufacturing.<\/p>\n      <\/a>\n    <\/div>\n  <\/div>\n\n  <!-- CTA -->\n  <div class=\"sb-hsm-cta\">\n    <h2>Request Human Serum Male \u2014 Quote or Sample<\/h2>\n    <p>EU and US origin available. Heat inactivated on request. Batch reservation for long-running studies. Full documentation included.<\/p>\n    <div class=\"sb-hsm-cta-btns\">\n      <a href=\"https:\/\/www.seamlessbio.de\/about-us\/contact-imprint\/\" class=\"sb-hsm-btn-w\">Contact Us<\/a>\n      <a href=\"mailto:info@seamlessbio.de?subject=Human%20Serum%20Male%20Quote\" class=\"sb-hsm-btn-o\">info@seamlessbio.de<\/a>\n    <\/div>\n    <p class=\"sb-hsm-ruo\">For research use only.<\/p>\n  <\/div>\n\n<\/div>\n<\/section>\n\n<style>\n.sb-hsm-page,.sb-hsm-page *,.sb-hsm-page *::before,.sb-hsm-page *::after{box-sizing:border-box}\n.sb-hsm-page{font-family:Arial,sans-serif;color:#1a1a1a;background:#fff;padding:60px 32px 90px}\n.sb-hsm-container{max-width:1200px;margin:0 auto}\n.sb-hsm-bc{display:flex;flex-wrap:wrap;gap:6px;align-items:center;font-size:13px;color:#888;margin-bottom:28px}\n.sb-hsm-bc a{color:#18b7b2!important;text-decoration:none!important;font-weight:600}\n.sb-hsm-bc strong{color:#111}\n.sb-hsm-bc span{color:#ccc}\n.sb-hsm-hero{display:grid;grid-template-columns:1.2fr 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