Used in immunological research to study T-cell regulation and immune responses. Functions as a soluble receptor to modulate signaling pathways involved in inflammation and autoimmunity. Employed in binding assays and protein interaction studies to investigate ligand-receptor dynamics. Supports development of therapeutic antibodies and diagnostic tools targeting CD5-expressing lymphocytes. Commonly applied in ELISA, flow cytometry, and surface plasmon resonance due to its tagged Fc region, enabling easy detection and purification.