Used in immunological research to quantify levels of the FOXP3 protein in biological samples. Essential for studying regulatory T cells (Tregs), which play a critical role in maintaining immune tolerance and preventing autoimmune diseases. Enables researchers to assess FOXP3 expression in cell cultures, tissue extracts, or isolated immune cells. Widely applied in studies related to cancer, inflammation, allergies, and transplant rejection. Supports development and validation of new immunotherapies by monitoring Treg activity. Provides a reliable, sensitive, and specific method for high-throughput screening in clinical and preclinical research settings.