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A. Flow Cytometric Analysis of Apoptosis of Different Tumor Cells Treated with NK Cells. The cells were stained with Annexin V-FITC and PI .The event in gate A1 show % of necrotic cells stained with PI and gate A3 shows % of viable cells. While gate A2 and A4 exhibit % of late apoptosis (0.7%) and early apoptosis (18.1%) respectively stained with Annexin V
