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The cytotoxic activity of hemocytes isolated from larvae of the blowfly Calliphora vicina was tested using human myelogenous leukemia K562 cells as target. Both single cell and cytotoxicity assays demonstrated that the hemocytes recognize the K562 cells as nonself, firmly attach to their surface and induce target destruction in a manner resembling the effect of mammalian cytotoxic lymphocytes. The...