Used in immunological research to quantify mouse programmed death receptor 1 (PD-1) levels in biological samples such as serum, plasma, or cell culture supernatants. This ELISA kit enables researchers to monitor immune cell activation and exhaustion, particularly in studies involving T-cell regulation, cancer immunotherapy, autoimmune diseases, and infectious disease models. It is a valuable tool for evaluating the effectiveness of checkpoint inhibitor therapies and understanding immune response modulation in preclinical mouse models. The assay provides high sensitivity and specificity, allowing accurate measurement of PD-1 expression changes in response to experimental treatments.