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MNCs were used as effector cells and K562 cells as target cells. The NK-cell percentage was determined by flow cytometry and the number of effector MNCs was counted accordingly. Cells were co-incubated for 6 h at +37°C at effector:target ratios 4∶1 and 8∶1. The graphs present alive K562 cells after the co-incubation with effector cells.
