{"product_id":"xr-nk-cell-expansion-kit-feeder-free","title":"XR NK Cell Expansion Kit (Feeder-Free)","description":"\u003c!--\nSEO TITLE:\nFeeder-Free NK Cell Expansion Supplement | Human NK Cell Activation Reagent\n\nMETA DESCRIPTION:\nXR NK Expansion Supplement supports feeder-free human NK cell activation and expansion from PBMC and cord blood samples with high purity and scalable culture performance.\n\nRECOMMENDED URL:\n\/products\/feeder-free-nk-cell-expansion-supplement\n\nPRIMARY KEYWORDS:\nNK Cell Expansion Supplement\nFeeder-Free NK Cell Expansion\nHuman NK Cell Expansion\nNK Cell Expansion Kit\nNK Cell Activation Reagent\n\nSECONDARY KEYWORDS:\nNatural Killer Cell Expansion\nHuman NK Cell Culture Medium\nNK Cell Culture Supplement\nPBMC-Derived NK Cell Expansion\nPeripheral Blood NK Cell Expansion\nCord Blood NK Cell Expansion\nFeeder-Free NK Cell Culture System\nImmune Cell Culture Medium\nCD56 Positive NK Cell Expansion\nCD56+CD16+ NK Cells\nNK Cell Immunotherapy Research\n--\u003e\n\u003cp\u003e\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\":\"https:\/\/schema.org\",\n  \"@type\":\"Product\",\n  \"name\":\"XR NK Expansion Supplement (Feeder-Free) Human NK Cell Expansion Supplement\",\n  \"description\":\"Feeder-free NK cell expansion supplement designed for human natural killer cell activation and expansion from peripheral blood and cord blood samples.\",\n  \"brand\":{\n    \"@type\":\"Brand\",\n    \"name\":\"XR\"\n  },\n  \"category\":\"Immune Cell Culture Reagent\",\n  \"sku\":\"XR-NK-EXP\",\n  \"additionalProperty\":[\n    {\n      \"@type\":\"PropertyValue\",\n      \"name\":\"Culture System\",\n      \"value\":\"Feeder-free NK cell expansion system\"\n    },\n    {\n      \"@type\":\"PropertyValue\",\n      \"name\":\"Application\",\n      \"value\":\"Human NK cell activation and expansion research\"\n    },\n    {\n      \"@type\":\"PropertyValue\",\n      \"name\":\"Compatible Samples\",\n      \"value\":\"Fresh and cryopreserved peripheral blood and cord blood samples\"\n    },\n    {\n      \"@type\":\"PropertyValue\",\n      \"name\":\"Storage\",\n      \"value\":\"-20°C\"\n    },\n    {\n      \"@type\":\"PropertyValue\",\n      \"name\":\"Endotoxin\",\n      \"value\":\"0.125 EU\/mL\"\n    }\n  ]\n}\n\u003c\/script\u003e \u003cscript type=\"application\/ld+json\"\u003e\n{\n \"@context\":\"https:\/\/schema.org\",\n \"@type\":\"FAQPage\",\n \"mainEntity\":[\n {\n \"@type\":\"Question\",\n \"name\":\"What is XR NK Expansion Supplement used for?\",\n \"acceptedAnswer\":{\n \"@type\":\"Answer\",\n \"text\":\"XR NK Expansion Supplement is a feeder-free NK cell expansion reagent designed for human natural killer cell activation and expansion from peripheral blood and cord blood samples.\"\n }\n },\n {\n \"@type\":\"Question\",\n \"name\":\"Is XR NK Expansion Supplement a feeder-free NK cell expansion system?\",\n \"acceptedAnswer\":{\n \"@type\":\"Answer\",\n \"text\":\"Yes. XR NK Expansion Supplement uses a cytokine-based feeder-free activation approach without requiring feeder cells for NK cell culture workflows.\"\n }\n },\n {\n \"@type\":\"Question\",\n \"name\":\"What samples are compatible with XR NK Expansion Supplement?\",\n \"acceptedAnswer\":{\n \"@type\":\"Answer\",\n \"text\":\"The product supports fresh and cryopreserved peripheral blood and cord blood derived samples for NK cell expansion research.\"\n }\n }\n ]\n}\n\u003c\/script\u003e\u003c\/p\u003e\n\u003cstyle\u003e\n\n\/* XR Series Product Page Style *\/\n\n.pdp-container {\nfont-family:-apple-system,BlinkMacSystemFont,\"Segoe UI\",Roboto,Helvetica,Arial,sans-serif;\ncolor:#333333;\nline-height:1.6;\nmax-width:1200px;\nmargin:0 auto;\npadding:15px;\n}\n\n\n.pdp-container h2 {\nfont-size:24px;\ncolor:#0B3C5D;\nborder-bottom:2px solid #328CC1;\npadding-bottom:8px;\nmargin-top:40px;\nmargin-bottom:20px;\nfont-weight:600;\n}\n\n\n.pdp-container h3 {\nfont-size:18px;\ncolor:#1D2731;\nmargin-top:30px;\nmargin-bottom:15px;\nfont-weight:600;\n}\n\n\n.pdp-container p {\nmargin-bottom:16px;\nfont-size:15px;\ncolor:#4A4A4A;\ntext-align:justify;\n}\n\n\n.pdp-container ul {\npadding-left:20px;\nmargin-bottom:24px;\n}\n\n\n.pdp-container li {\nmargin-bottom:10px;\nfont-size:15px;\ncolor:#4A4A4A;\nlist-style-type:square;\n}\n\n\n.pdp-table-responsive {\nwidth:100%;\noverflow-x:auto;\nmargin:25px 0;\nborder:1px solid #E0E0E0;\nborder-radius:6px;\n}\n\n\n.pdp-table {\nwidth:100%;\nborder-collapse:collapse;\nmin-width:650px;\nbackground:#FFFFFF;\n}\n\n\n.pdp-table td {\npadding:12px 16px;\nborder-bottom:1px solid #E0E0E0;\nfont-size:14px;\n}\n\n\n.pdp-table tr:nth-child(even){\nbackground:#F8F9FA;\n}\n\n\n.pdp-table td strong{\ncolor:#0B3C5D;\n}\n\n\n.pdp-img-container {\nmax-width:650px;\nmargin:24px auto;\npadding:10px;\nborder:1px solid #EEEEEE;\nborder-radius:8px;\nbackground:#FFFFFF;\ntext-align:center;\n}\n\n\n.pdp-img-container img{\nmax-width:100%;\nheight:auto;\ndisplay:block;\nmargin:auto;\n}\n\n\n.pdp-container details{\nbackground:#F8F9FA;\nborder:1px solid #E0E0E0;\nborder-radius:6px;\nmargin-bottom:12px;\npadding:14px 18px;\n}\n\n\n.pdp-container summary{\nfont-weight:600;\ncolor:#0B3C5D;\ncursor:pointer;\nfont-size:15px;\n}\n\n\n.pdp-container details p{\nmargin-top:12px;\nborder-top:1px dashed #E0E0E0;\npadding-top:12px;\n}\n\n\n@media(max-width:768px){\n\n.pdp-container h2{\nfont-size:20px;\n}\n\n.pdp-container p,\n.pdp-container li{\nfont-size:14px;\n}\n\n}\n\n\u003c\/style\u003e\n\u003cdiv class=\"pdp-container\"\u003e\n\u003ch2\u003eDescription\u003c\/h2\u003e\n\u003cp\u003eExpanding human natural killer (NK) cells while maintaining high purity and functional activity remains a key challenge in immune cell research. Conventional NK cell culture workflows may require feeder cells, complex activation procedures, or inconsistent stimulation conditions, which can increase variability between experiments and complicate scale-up applications.\u003c\/p\u003e\n\u003cp\u003eXR NK Expansion Supplement (Feeder-Free) is a cytokine-based NK cell expansion supplement designed for feeder-free human NK cell activation and expansion. The optimized formulation supports NK cell culture workflows using fresh or cryopreserved peripheral blood and cord blood derived samples, helping researchers achieve reliable expansion performance without the need for feeder cell support.\u003c\/p\u003e\n\u003cp\u003eDesigned for combination with XR NK basal culture medium, this NK cell activation reagent provides a controlled solution for natural killer cell expansion research, immune cell characterization, and functional NK cell studies.\u003c\/p\u003e\n\u003cp\u003eWith support for laboratory-scale expansion systems from 2–4 L and potential scalability to larger culture volumes, XR NK Expansion Supplement provides researchers with a flexible platform for PBMC-derived NK cell expansion and cord blood NK cell expansion applications.\u003c\/p\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cdiv class=\"pdp-table-responsive\"\u003e\n\u003ctable class=\"pdp-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct Name\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eXR NK Expansion Supplement (Feeder-Free)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFeeder-free NK cell expansion supplement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eApplication\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHuman natural killer cell activation and expansion research\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Samples\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFresh peripheral blood, frozen peripheral blood, fresh cord blood, frozen cord blood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCulture System\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCytokine-based feeder-free NK cell expansion system\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRecommended Culture Scale\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2–4 L expansion system, scalable to larger culture volumes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNK Cell Purity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e70–95% from peripheral blood samples; ≥90% from cord blood samples\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eComponents\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eXRNK00 coating solution, XRNK01 activation solution A, XRNK02 activation solution B, XRNK03 expansion solution C, repair factor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStorage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-20°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eEndotoxin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.125 EU\/mL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBacteria Detection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNot detected\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFungi Detection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNot detected\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShelf Life\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eResearch Grade\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eResearch Use Only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eFeeder-Free NK Cell Expansion Platform\u003c\/strong\u003e\u003cbr\u003eXR NK Expansion Supplement provides a feeder-free approach for human NK cell activation and expansion, eliminating the requirement for external feeder cells and supporting a more controlled NK cell culture workflow.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCytokine-Based NK Cell Activation\u003c\/strong\u003e\u003cbr\u003eThe optimized cytokine formulation supports efficient activation signals during early NK cell culture stages, promoting natural killer cell proliferation and expansion.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSupports Multiple Human Sample Sources\u003c\/strong\u003e\u003cbr\u003eDesigned for NK cell expansion from fresh or cryopreserved peripheral blood and cord blood derived samples, providing flexibility for different immune cell research workflows.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHigh NK Cell Expansion Purity\u003c\/strong\u003e\u003cbr\u003eXR NK Expansion Supplement supports enriched NK cell populations, achieving 70–95% NK purity from peripheral blood samples and ≥90% NK purity from cord blood samples.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eScalable NK Cell Expansion Workflow\u003c\/strong\u003e\u003cbr\u003eSuitable for laboratory expansion systems from 2–4 L and can support larger culture volumes, making it suitable for research-scale NK cell expansion studies.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eConsistent Batch Performance\u003c\/strong\u003e\u003cbr\u003eManufactured using GMP-grade raw materials to improve lot-to-lot consistency for reproducible immune cell culture applications.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSupports Functional NK Cell Research\u003c\/strong\u003e\u003cbr\u003eExpanded NK cells can be used for downstream immune profiling, cytotoxicity analysis, activation marker detection, and natural killer cell functional studies.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePerformance Data\u003c\/h2\u003e\n\u003ch3\u003eHuman NK Cell Expansion Performance from Peripheral Blood and Cord Blood Samples\u003c\/h3\u003e\n\u003cp\u003eReliable expansion of primary human NK cells requires a culture system capable of supporting proliferation while maintaining NK cell characteristics. XR NK Expansion Supplement was evaluated using peripheral blood mononuclear cell (PBMC) and cord blood mononuclear cell (CBMC) derived samples to assess NK cell expansion performance.\u003c\/p\u003e\n\u003cp\u003eDuring the expansion process, NK cell numbers increased progressively over the culture period. Both peripheral blood and cord blood derived samples demonstrated continuous expansion capability, supporting the application of XR NK Expansion Supplement in primary human NK cell culture workflows.\u003c\/p\u003e\n\u003c!-- PERFORMANCE IMAGE 1 --\u003e\n\u003cdiv class=\"pdp-img-container\" style=\"text-align: center;\"\u003e\n\u003cimg alt=\"Human NK cell expansion curve showing PBMC and cord blood derived NK cell proliferation using XR NK Expansion Supplement\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0521\/5312\/2997\/files\/3_14c39eb1-f293-4e54-9788-91a62c87d527.jpg?v=1784100317\" style=\"float: none;\"\u003e\n\u003cp\u003eRecommended image: NK cell expansion curve showing cell growth over culture time from peripheral blood and cord blood derived samples.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eNK Cell Purity Analysis by Flow Cytometry\u003c\/h3\u003e\n\u003cp\u003eExpanded NK cells were characterized by flow cytometry using commonly analyzed NK cell surface markers, including CD3, CD56, and CD16 expression profiles.\u003c\/p\u003e\n\u003cp\u003eThe analysis demonstrates enrichment of CD3-negative and CD56-positive NK cell populations following expansion, with CD16 expression analysis providing additional characterization of mature NK cell subsets.\u003c\/p\u003e\n\u003c!-- PERFORMANCE IMAGE 2 --\u003e\n\u003cdiv class=\"pdp-img-container\" style=\"text-align: center;\"\u003e\n\u003cimg alt=\"Flow cytometry analysis of CD56 positive CD16 positive human NK cells expanded with feeder-free NK cell expansion supplement\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0521\/5312\/2997\/files\/2_0c59046b-2861-4723-951c-39ac8e115867.jpg?v=1784100317\" style=\"float: none;\"\u003e\n\u003cp\u003eRecommended image: Flow cytometry plots showing NK cell phenotype analysis after expansion.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eApplication-Oriented NK Cell Expansion Workflow\u003c\/h3\u003e\n\u003cp\u003eXR NK Expansion Supplement is designed to support researchers developing reproducible NK cell culture workflows, from initial immune cell activation through expansion and downstream functional analysis.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eInitial activation of human NK cells from peripheral blood or cord blood derived samples\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eExpansion of NK cell populations under feeder-free culture conditions\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePreparation of expanded NK cells for immune phenotype characterization\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eFunctional assessment including cytotoxic activity and immune response studies\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cp\u003eXR NK Expansion Supplement (Feeder-Free) is designed for laboratories performing human NK cell expansion and immune cell research workflows where consistent activation, expansion efficiency, and controlled culture conditions are important.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHuman NK Cell Expansion Research\u003c\/strong\u003e\u003cbr\u003eSupports expansion of primary human natural killer cells for immunology research and cell-based assay development.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003ePBMC-Derived NK Cell Expansion\u003c\/strong\u003e\u003cbr\u003eEnables NK cell culture workflows starting from peripheral blood mononuclear cell populations.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCord Blood NK Cell Expansion\u003c\/strong\u003e\u003cbr\u003eSuitable for studies involving cord blood derived NK cells and immune cell development research.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eFeeder-Free NK Cell Culture Studies\u003c\/strong\u003e\u003cbr\u003eProvides an alternative to feeder cell-dependent NK expansion systems for controlled laboratory workflows.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eNK Cell Activation Research\u003c\/strong\u003e\u003cbr\u003eUsed for investigating NK activation pathways, cytokine responses, and immune cell stimulation mechanisms.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eNK Cell Cytotoxicity Studies\u003c\/strong\u003e\u003cbr\u003eExpanded NK cells can be used in downstream assays evaluating target cell killing activity and immune function.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eImmune Cell Phenotyping\u003c\/strong\u003e\u003cbr\u003eSupports analysis of NK-associated markers including CD56 and CD16 expression profiles.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eNK Cell Immunotherapy Research\u003c\/strong\u003e\u003cbr\u003eApplicable for exploratory research related to adoptive NK cell approaches and immune cell engineering studies.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eLarge-Scale NK Cell Expansion Development\u003c\/strong\u003e\u003cbr\u003eSuitable for researchers optimizing scalable NK cell culture processes.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhy Choose XR NK Expansion Supplement?\u003c\/h2\u003e\n\u003cp\u003eExpanding primary human NK cells requires a balance between activation efficiency, cell quality, and workflow consistency. Variations in donor samples, stimulation methods, and culture conditions can affect NK cell expansion results and downstream experimental reproducibility.\u003c\/p\u003e\n\u003cp\u003eXR NK Expansion Supplement provides a feeder-free NK cell expansion solution based on optimized cytokine stimulation. By avoiding feeder cell preparation, researchers can simplify NK culture workflows while maintaining a controlled environment for immune cell expansion studies.\u003c\/p\u003e\n\u003cp\u003eThe compatibility with both peripheral blood and cord blood samples allows researchers to establish flexible NK cell expansion workflows across different sample sources. Combined with high NK purity performance and scalable culture capability, XR NK Expansion Supplement is suitable for laboratories studying natural killer cell biology and immune cell applications.\u003c\/p\u003e\n\u003ch2\u003eRecommended NK Cell Expansion Workflow\u003c\/h2\u003e\n\u003ch3\u003eStep 1: Sample Preparation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003ePrepare human peripheral blood or cord blood derived immune cell samples according to laboratory protocols.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eIsolate peripheral blood mononuclear cells (PBMCs) or prepare cryopreserved samples for NK cell expansion.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eStep 2: NK Cell Activation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003ePrepare culture system using XR NK basal medium combined with XR NK Expansion Supplement components.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eApply activation components according to the recommended NK cell expansion protocol.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eInitiate cytokine-based stimulation under feeder-free culture conditions.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eStep 3: NK Cell Expansion\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eMaintain cells under optimized culture conditions and monitor cell growth during expansion.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eAdjust culture volume according to cell density and expansion requirements.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eEvaluate NK cell expansion performance using cell counting and flow cytometry analysis.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eStep 4: Downstream Functional Analysis\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eAnalyze NK cell phenotype using CD3, CD56, and CD16 markers.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePerform downstream assays including immune activation analysis and cytotoxicity evaluation.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is XR NK Expansion Supplement (Feeder-Free)?\u003c\/summary\u003e\n\u003cp\u003eXR NK Expansion Supplement (Feeder-Free) is a cytokine-based NK cell expansion supplement designed for human natural killer cell activation and expansion without the use of feeder cells. It supports primary NK cell culture workflows from peripheral blood and cord blood derived samples.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is a feeder-free NK cell expansion system?\u003c\/summary\u003e\n\u003cp\u003eA feeder-free NK cell expansion system is a culture method that stimulates NK cell activation and proliferation without using feeder cells. XR NK Expansion Supplement uses optimized cytokine-based stimulation to support controlled human NK cell expansion workflows.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat samples can be used with XR NK Expansion Supplement?\u003c\/summary\u003e\n\u003cp\u003eXR NK Expansion Supplement supports NK cell expansion from fresh peripheral blood, frozen peripheral blood, fresh cord blood, and frozen cord blood derived samples, providing flexibility for different immune cell research applications.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan XR NK Expansion Supplement be used for PBMC-derived NK cell expansion?\u003c\/summary\u003e\n\u003cp\u003eYes. XR NK Expansion Supplement is designed for PBMC-derived NK cell expansion research. Peripheral blood mononuclear cell samples can be used as starting material for human NK cell activation and expansion workflows.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan XR NK Expansion Supplement support cord blood NK cell expansion?\u003c\/summary\u003e\n\u003cp\u003eYes. XR NK Expansion Supplement supports cord blood derived NK cell expansion research. According to product performance evaluation, cord blood samples can achieve high NK cell purity after expansion.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between feeder-free and feeder-based NK cell expansion?\u003c\/summary\u003e\n\u003cp\u003eFeeder-based NK cell expansion methods require additional feeder cells to provide activation signals, while feeder-free NK expansion systems rely on defined stimulation components such as cytokines. Feeder-free workflows can simplify culture procedures and improve process control for research applications.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat markers are commonly used to identify expanded NK cells?\u003c\/summary\u003e\n\u003cp\u003eExpanded human NK cells are commonly characterized by flow cytometry markers including CD3, CD56, and CD16. Typical NK cell populations are identified as CD3-negative and CD56-positive cells, with CD16 expression used for additional subset characterization.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat NK cell purity can be achieved with XR NK Expansion Supplement?\u003c\/summary\u003e\n\u003cp\u003eXR NK Expansion Supplement supports enriched NK cell populations. Peripheral blood derived samples can achieve approximately 70–95% NK cell purity, while cord blood derived samples can achieve NK cell purity above 90% under evaluated conditions.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan XR NK Expansion Supplement be used for NK cell immunotherapy research?\u003c\/summary\u003e\n\u003cp\u003eYes. XR NK Expansion Supplement is suitable for research applications involving NK cell biology, immune cell characterization, cytotoxicity studies, and exploratory NK cell immunotherapy research workflows.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes XR NK Expansion Supplement require feeder cells?\u003c\/summary\u003e\n\u003cp\u003eNo. XR NK Expansion Supplement is designed as a feeder-free NK cell expansion supplement and does not require external feeder cell support for NK cell culture workflows.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow should XR NK Expansion Supplement be stored?\u003c\/summary\u003e\n\u003cp\u003eXR NK Expansion Supplement should be stored at -20°C. Under recommended storage conditions, the product has a shelf life of 12 months.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the recommended expansion scale for XR NK Expansion Supplement?\u003c\/summary\u003e\n\u003cp\u003eOne set of XR NK Expansion Supplement is recommended for 2–4 L NK cell expansion systems and can support larger-scale expansion workflows depending on experimental requirements.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e","brand":"XRbio","offers":[{"title":"1Kit","offer_id":52804989354165,"sku":"XRNKFF","price":0.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0521\/5312\/2997\/files\/1_6dec66b7-c360-4b41-b43d-806be2666d38.jpg?v=1784100459","url":"https:\/\/biofargo.com\/products\/xr-nk-cell-expansion-kit-feeder-free","provider":"Biofargo","version":"1.0","type":"link"}