Fig 2. The antioxidant capacity of QBC939 cells were stronger than HepG2 cells.

(A) Cells were treated with H₂O₂ (50 μM) or cisplatin (10 or 20 μg/ml) for 24 h, and then cell viability was determined by MTT assays. (B) The intracellular GSH/GSSG ratio was determined after incubation under basal conditions. (C) Overall ROS and (D) mtROS were measured in QBC939 cells and HepG2 cells treated with 500 μM H₂O₂ for 2 h (×200). All values are the mean±SE. *p<0.05 between QBC939 cells group and HepG2 cells group.