Used to measure levels of interleukin-1 receptor antagonist (IL-1RA) in biological samples from monkeys, such as serum, plasma, or cell culture supernatants. This kit is commonly applied in immunology and inflammation research to study the regulation of immune responses. It helps in evaluating the role of IL-1RA in disease models involving inflammation, autoimmune disorders, or infections in non-human primates. The assay provides a quantitative analysis, enabling researchers to monitor changes in IL-1RA concentration during experimental treatments or disease progression.