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Effect of FZK and DOX on cell death. (A) Cytotoxicity: the cell viabilities of H9C2 cells treated with different concentrations of DOX or FZK. (B) Cytoprotective: the cell protection rate of H9C2 cells with or without pretreatment with different concentrations of FZK or HPS (positive control) before DOX. (C) Effect of FZK on the antitumor activity of DOX in HeLa cells. Data are mean ± SD (n = 3). *P < 0.05 vs control; #P < 0.05 vs DOX.
