The apoptotic cells were measured by flow cytometry using an annexin V–FITC/propidium iodide apoptosis detection kit (Abcam, Cambridge, UK) in U2OS cells. The fluorescence intensity was detected at 488 nm using flow cytometry. Cells were sorted by the FACSCalibur flow cytometer (Becton Dickinson, San Diego,CA), and analyzed using CellQuest software (Becton Dickinson).
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