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PGL induced apoptosis in A549, MKN28, and B16 cells. Apoptotic cells were detected by flow cytometry after PGL (60 µg/mL) treatment for 48 and 72 h in (A) the human lung cancer cell line A549; (B) the gastric cancer cell line MKN28; and (C) the mouse melanoma cell line B16; (D) Early and late apoptotic rates were analyzed by flow cytometry. Bars = the mean ± S.D., n = 3, * p < 0.05 and ** p < 0.01 indicate significant differences between the control and PGL-treated groups.
