KLRK1 and neoplasm: In addition, some DAMPs are vital for recognition and elimination of tumor cells by natural killer (NK) cells, including NKG2D ligands such as major histocompatibility complex class I polypeptide-related sequence A (MICA), major histocompatibility complex class I polypeptide-related sequence B (MICB), retinoic acid early transcript (RAET)1E, and the UL16 binding protein (ULBP) family (12, 13).