Figure 4. Zhoushi Qiling decoction induces apoptosis of DU145 human prostate cancer cells after 24 hours of treatment. (A) Apoptotic cells were evaluated by PI and Annexin V staining assay. (B) Apoptotic cell rate was expressed as the percentage of total cells. Data were expressed as mean ± SD from three independent experiments with triple replicates per experiment. * p < 0.05, ** p < 0.01 compared with control group. &p < 0.05 compared with ZQD-50 group.