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Effect of celastrol and cisplatin on the protein expression levels of caspase-3 and PARP in U-2OS cells. (A) Representative blotting image of caspase-3; (B) quantification of relative caspase levels. (C) Representative blotting image of PARP; (D) quantification of relative PARP levels. β-actin was used as the internal control. The data are presented as the mean ± standard deviation. **P<0.01, ***P<0.001 vs. control cells. PARP, poly(ADP-ribose) polymerase.
