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Effect of the methanolic extract, alkaloid and terpenoid fractions of Stachys pilifera and cisplatin on the activity of (A) caspase-8 and (B) caspase-9 in the HT-29 cell line. Values are expressed as means ± SD of 3 experiments. # Significantly different from cisplatin. #P < 0.05, ##P < 0.01, and ###P < 0.001.
