Receptor on natural killer (NK) cells for HLA-C alleles (HLA- Cw1, HLA-Cw3 and HLA-Cw7). Inhibits the activity of NK cells thus preventing cell lysis. This is the function of KIR2DL3 (killer cell immunoglobulin like receptor, two Ig domains and long cytoplasmic tail 3, ENSG00000243772).