Fig. 2

Cell viability determined by MTT assay. a Cells were incubated with the increasing concentrations of H₂O₂ (0–400 µM) for 4 h; b MCF-7 cells were treated with 300 µM of H₂O₂ for the times indicated. Values are described as the mean ± SD, n = 6. *p < 0.05 compared with untreated control MCF-7 cells