Used to measure the concentration of the IL-12/23 p40 subunit in biological samples such as serum, plasma, or cell culture supernatants from non-human primates. This assay is particularly useful in immunology and infectious disease research where monitoring the activation of the Th1 immune response is critical. It supports studies on vaccine development, autoimmune diseases, and inflammatory conditions by providing a reliable and sensitive method to quantify this key cytokine involved in immune regulation. The kit enables researchers to evaluate the efficacy of therapeutic interventions and to understand immune responses in preclinical models involving monkeys.