Used in immunological research to study the role of MER receptor tyrosine kinase in macrophage function and immune regulation. The Fc tag enables easy detection and purification, making it valuable in binding assays and protein-protein interaction studies. Commonly applied in ELISA, flow cytometry, and functional assays to investigate MER-mediated signaling pathways involved in phagocytosis, inflammation, and cancer immunotherapy. Also utilized in developing therapeutic antibodies and diagnostic tools targeting MER-expressing cells.