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The effects of alkaloids on caspase-3 protein expression levels of Dox-treated H9c2 cells. The cells were pretreated with different concentrations of alk-A and alk-B (10, 20, and 40 µM) for 1 h, then exposed to Dox for 24 h (A). Relative folds of cleaved-caspase-3 (B). Results are mean ± SEM from three independent experiments. ## p < 0.001 vs. control, * p < 0.05, ** p < 0.01 vs. Dox group.
