Used in immunological research to quantify levels of Forkhead Box P3 (FOXP3) protein in biological samples, this ELISA kit enables the detection and measurement of regulatory T cells (Tregs) activity. FOXP3 is a key transcription factor associated with the development and function of Tregs, which play a critical role in maintaining immune tolerance and preventing autoimmune diseases. The kit supports studies in autoimmune disorders, cancer immunology, transplantation, and inflammatory diseases by providing a reliable method to assess FOXP3 expression. It is commonly used in preclinical research, biomarker validation, and therapeutic development involving immune modulation.