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Cytotoxic activity of bergenin on HeLa and HepG2 cells. The cells were treated with different concentrations of bergenin (0.1–5 mg/ml) for 72 h. The cytotoxic activity was assessed with the MTT assay. Data are expressed as means ± SEM and the results represent three independent experiments. *P<0.05 and **P<0.01 vs. dimethyl sulfoxide (DMSO) control of HeLa cells. #P<0.05 vs. DMSO control of HepG2 cells. OD, optical density.
