Cells were harvested at each indicated time point of 24, 48, and 72 h, washed twice with cold PBS, and stained with AnnexinV-APC and PI using APC-AnnexinV Binding apoptosis assay kit (Cat Nr. 22837, AAT Bioquest, USA) for 15 min at room temperature according to the manufacturer’s instructions (Invitrogen, China). Apoptosis cells were quantified using FACSCalibur™ cytometer (BD Biosciences, USA), and analyzed by CellQuestPro software.
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