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Measurement of caspase 9 activity by Pleiocarpa pycnantha and isolated compounds. a Treatment of cells with various concentration of extract P for 6–24 h. b Cells were treated with increasing concentrations of compound C2 for 6–24 h. c Measurement of caspase 9 activity when cells were treated with different concentrations of compound C3 for 6–24 h. Data are presented as mean ± SEM, ***P < 0.001, **P < 0.01 and *P < 0.05 compared with control
