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Cytotoxic assay in NK cells treated with H2O2. Resting NK (n = 5) and expanded NK (n = 5) were treated with H2O2 (0 and 80 µM) for 24 h, and then subjected to cytotoxic assay against K562 cells in a calcein-release assay. E:T ratio, effector:K562 ratio. ***p < 0.001, **p < 0.01, *p < 0.05
