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Apoptosis-inducing effect of PEO in HepG2 and A549 cells stained with Hoechst 33342. HepG2 and A549 cells were treated with or without different concentrations of PEO (30, 60, and 90 μg/mL) for 24 h, then stained with Hoechst 33342 for 15 min at 37 °C. After washing twice with PBS, the cells were photographed using ImageXpress Micro Confocal High-Content Imaging System. White arrows indicate apoptotic bodies.
