Definitions for "Natural killer cell"
(NA-tchah-ruhl KILL-er sell) White blood cell that can recognize microbes and tumor cells as ‘foreign' and destroy them, without requiring prior exposure to them
Large granular lympohocytes lacking T and B lymphocyte antigen receptor gene arrangement. Exert cytotoxic effects with undefined specificity but without being major histocompatibility complex (MHC) restricted.
Bone marrow-derived, mononuclear white blood cells (large granular lymphocytes) that are able to kill invading microorganisms without activation by cells of the immune system. They are, therefore, part of the innate immune system. They are specialized in killing virus-infected cells and cells transformed to develop cancer.