KLRK1 (Killer Cell Lectin Like Receptor K1): KLRK1 is a gene that encodes an activating receptor found on natural killer (NK) cells and certain T cells. It plays a crucial role in immune surveillance by recognising stress-induced ligands on target cells, which leads to the elimination of infected or transformed cells. KLRK1 is vital for the body’s defence against viral infections and specific cancers.