Cells were seeded in 6-well plate at a density of 2 × 105/well and allowed to adhere overnight. Treatment and incubation period were performed as required. Cell apoptosis was determined by Annexin V/PI labeling according to the manufacturer’s protocol (Invitrogen). The early and late apoptotic cells were detected using a flow cytometry (BD FACS CantoTM, BD Biosciences, San Jose, CA, United States) based on the Annexin V and PI staining.
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