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Natural killer (NK) (a) and lymphokine-activated killer (LAK) (b) cell-mediated cytotoxicity against untreated U937 cells (▿), phorbol 12-myristate 13-acetate (PMA)-differentiated U937 cells (▵), K562 (•) and Daudi (▪). Cytotoxicity was determined after 4 hr. Each data point represents the mean percentage kill of duplicate experiments.
