Cells (2 × 105) were treated with 50 μmol/L of cytarabine (Pharmacia & Upjohn, Kalamazoo, MI, USA), or 50 μmol/L normal saline as the negtive control (NC). Cells were harvested at 24 hours after treatment. Apoptosis was detected using an FITC Annexin V/PI Kit (BD, San Jose, CA, USA), and cells were analyzed immediately by flow cytometry (FACS Aria II; BD). Annexin V+/PI− cells identified early apoptosis.
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