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Cellular Technology Limited (CTL) is the pioneer and industry leader in the development, use, and manufacture of standardized immune monitoring tools. Through ceaseless innovation and dedication to the highest principles of scientific rigor and customer support, CTL has launched the immune monitoring industry to new heights. ImmunoSpot® Analyzers High-throughput cell imaging ELISPOT, multicolor FluoroSpot Live/Dead/Apoptotic, NK-assays Cytotoxicity assays, Colony/Plaque assays Scientifically-validated counting technique Learn more ImmunoSpot® Kits Single- and double-color T cell and B cell ELISPOT Kits Up to four-color T cell and B cell FluoroSpot Kits Mouse T cell and B cell ELISPOT and FluoroSpot Kits Learn more Cryopreserved PBMC Extensive library of HLA-typed donors References samples Antigen-specific cytokine responses to Class I & II-restricted peptides NK-cell characterized ePBMC® Hundreds of identical samples available for large clinical studies Learn more Serum-Free Media for PBMC Testing and Cryopreservation Optimized for consistent, standardized performance in immune assays Formulated for high signal, low background Ideal for ELISPOT, FluoroSpot and other immune monitoring assays Learn more Positive Controls for T cell activation HLA-Class I- restricted peptides as positive controls for CD8+ T cell functionality HLA-Class II- restricted proteins as positive controls for CD4+ T cell and antigen presenting cell (APC) functionality Learn more 
