Used in immunological research to study T-cell activation and co-stimulatory signaling pathways. Serves as a ligand for OX40 receptor, enabling investigation of immune responses, inflammation, and development of immunotherapies. Employed in binding assays, protein-protein interaction studies, and functional assays to evaluate immune cell proliferation and cytokine production. The Fc tag facilitates detection, purification, and immobilization in experimental systems, making it valuable for in vitro and in vivo studies focused on modulating immune activity.