Hu Recom IL-21, 500 µg

Purified recombinant human Interleukin-21 (IL-21) supplied by STEMCELL Technologies as a 500 µg vial of bioactive cytokine. This reagent supports in vitro studies of lymphocyte biology, including the differentiation of B cells into plasma cells, the proliferation and cytotoxic function of CD8+ T cells, and the maturation of natural killer (NK) cells. Researchers incorporate this protein into T cell and NK cell expansion protocols, including workflows for generating cytokine-induced killer cells and supporting chimeric antigen receptor (CAR) T cell culture systems.

The cytokine is intended for reconstitution in sterile water or culture medium before dilution into working concentrations. Aliquot the reconstituted stock to minimize repeated freeze-thaw cycles, store at -20°C to -80°C, and protect from light to preserve bioactivity. For research use only, not for diagnostic or therapeutic administration in humans. Activity is verified by a cell-based proliferation assay, and the product is widely used in academic and translational immunology laboratories investigating immune signaling pathways, immunoglobulin class switching, and adoptive cell therapy development.