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 detecting stress-induced ligands on target cells, which prompts the removal of infected or altered cells. KLRK1 is vital for the body's defense against viral infections and specific types of cancer.