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Cytotoxic effect of tanshinones on human cancer cell lines. The cells were treated with different concentrations of DHTS, CTS and TS I for 24 h, and then percentage of cell survival was determined using the MTT assay. Results are expressed as the mean ± standard error of the mean (n=3). DHTS, dihydrotanshinone I; CTS, cryptotanshinone; TS I, tanshinone I.
