Used to measure interleukin-2 (IL-2) levels in biological samples such as serum, plasma, or cell culture supernatants from rats. It is commonly applied in immunology research to study T-cell activation and immune responses. The kit helps evaluate the effects of drugs, vaccines, or diseases on the immune system by quantifying IL-2, a key cytokine involved in lymphocyte proliferation and regulation. Widely used in preclinical studies, toxicology, and inflammation research.