Used in immunological research to study the function of butyrophilin subfamily 1 member A1 (BTN1A1) in immune regulation, particularly in T cell activation and lipid metabolism. The Fc tag enables easy detection, purification, and potential dimerization for functional assays. Commonly applied in ELISA, flow cytometry, and protein-protein interaction studies. Supports development of therapeutic antibodies and investigation of mammary gland biology and milk lipid secretion due to BTN1A1's role in these processes.