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K cells cells mediating antibody-dependent cell-mediated cytotoxicity; they are small lymphocytes without T or B cell surface markers and recognize immunoglobulin G (IgG) antibody coating the target cell by means of Fc receptors. Breakdown of the target cell is extracellular, requires direct cell-to-cell contact, and does not involve complement. Called also killer cells. a type of cell found mainly in the mucous membranes of the duodenum and jejunum; they synthesize gastric inhibitory polypeptide.
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