Used in immunological research to study natural killer (NK) cell regulation and immune responses in non-human primates. Helps in understanding KIR receptor-ligand interactions, particularly in models of infectious disease, transplantation, and autoimmunity. The Fc tag enables detection, purification, and functional assays such as flow cytometry, ELISA, and binding studies. Supports development of therapeutic antibodies and evaluation of immune modulation strategies in preclinical primate models.