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QUE and SFN in combination with OXP decreased intracellular GSH level in HCT116 cells. The cells were treated with different combinations QUE and OXP in the absence (A) or presence of SFN (B) for 72 h. The total GSH levels were then measured and normalized to the total protein content. Error bars, mean ± SEM (N = 3). Significant differences among treatments were denoted by different alphabetical letters (p < 0.05, one-way ANOVA with Duncan’s post hoc HSD test).
