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The effect of PD on cells apoptosis index in U251 cells. (A) Hoechst 33258 staining (×200); (B) cell apoptosis index. U251 cells were treated with 0, 16.3, 40.8, 81.6 and 163.2 μM of PD for 48 h. Then they were stained with Hoechst 33258. Each value is presented as mean ± SD (n = 3). ** p < 0.01 compared with 0 μM PD.
