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Mitochondria damage, triggered by ZnO NPs and ZnO. (A) HepG cells were treated with 20 μg/mL ZnO NPs and ZnO for 24 h; the MMP was detected by JC-1 staining. Red shows the aggregate form of JC-1, representing the normal MMP; green shows the monomer form of JC-1, representing the decreased MMP (200×). Data represent the mean ± SD from three independent experiments. ** p < 0.01, compared to the control group; # p value = 0.0281, compared to the ZnO NPs group.
