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(A) Chemical structure of Tanshinone II A. (B) Cell proliferation rate at different concentrations (0, 2, 4, 8 μm) and different time (24, 48, 72 h) by using MTT assay after administration of Tanshinone II A. *P<0.05, **P<0.01, ***P<0.005. (C,D) ELISA analysis of the caspase9 and caspase3 activity in HeLa cells. * P<0.05, **P<0.01, ***P<0.005.
