Used in immunological research to study cell adhesion and signaling processes. Employed in protein-protein interaction studies due to its role in immune regulation. Serves as a detection tool in assays when fused with His tag, enabling easy purification and immobilization via nickel-based chromatography. Applied in ELISA, Western blotting, and surface plasmon resonance to analyze binding kinetics with pathogens or immune receptors. Utilized in cancer research for its involvement in tumor progression and immune evasion. Supports development of diagnostic tools and therapeutic candidates targeting CEACAM1 pathways.