Used in immunological research to quantify FOXP3 protein levels in biological samples, this ELISA kit helps study regulatory T cells (Tregs) involved in immune tolerance and suppression of excessive immune responses. It is widely applied in research on autoimmune diseases, cancer immunology, transplant rejection, and chronic inflammation. By measuring FOXP3 expression, researchers can assess Treg activity and evaluate potential immunotherapies or disease mechanisms in both preclinical and clinical studies. The kit provides a reliable, sensitive, and high-throughput method for protein detection in cell lysates or tissue extracts.