NK cells

NK cells
natural killer cells; cells capable of mediating cytotoxic reactions without prior sensitization against the target. NK cells are small lymphocytes without B or T cell surface markers that originate in the bone marrow and develop fully in the absence of the thymus; their cytotoxic activity is not antibody-dependent. They can lyse a wide variety of tumor cells and other cell types and are probably important in natural resistance to tumors. Interferon augments their activity. See lymphocyte.

Medical dictionary. 2011.

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