Human Interleukin 21 (IL-21) ELISA Kit

Interleukin-21 is a pleiotropic cytokine secreted chiefly by activated CD4+ T follicular helper and Th17 cells, where it engages the IL-21 receptor on B lymphocytes, NK cells, and additional T cell subsets to drive proliferation, class-switch recombination, and cytotoxic differentiation.

The Assay Genie kit provides a quantitative immunoassay for measuring endogenous human IL-21 across multiple sample matrices, supporting research into autoimmune disease, inflammatory disorders, and tumor immunology. All reagents are supplied in a pre-coated microplate layout together with reference standards and detection antibodies, and the workflow uses standard washing and incubation at room temperature. Research use only.