NCIt definition : A family of receptors belonging to the immunoglobulin superfamily that are mainly
expressed on natural killer (NK) cells. Natural cytotoxicity receptors (NCR) bind
to a broad range of ligands derived from microbes, tumors, and endogenous sources.
Predominantly, ligand binding leads to the activation of NK cells, which stimulates
cell-mediated cytotoxic immune responses, but some ligands may inhibit NK cell activation.;
NCIt note : Humans express three of the natural cytotoxicity receptor family proteins.;