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Majority of the cancer tissues showed weak to moderate cytoplasmic, membranous and nuclear staining. Several cases of ovarian, pancreas and few cases of stomach, testis, renal and urothelial cancers exhibited moderate cytoplasmic and membranous positivity. Lymphomas, gliomas and endometrial cancers were negative.
Cytolytic T lymphocytes (CTL) and natural killer (NK) cells share the remarkable ability to recognize, bind, and lyse specific target cells. They are thought to protect their host by lysing cells bearing on their surface 'nonself' antigens, usually peptides or proteins resulting from infection by intracellular pathogens. The protein described here is a T cell- and natural killer cell-specific serine protease that may function as a common component necessary for lysis of target cells by cytotoxic T lymphocytes and natural killer cells. [provided by RefSeq, Jul 2008]