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Effects of extract DP on ROS production on HL-60 cells; Cells were treated with extract for 24 h followed by staining with DCHFH2-DA (5 μM), incubated for 30 min and the fluorescence in the cells was immediately analyzed using flow cytometry. Data are presented the fluorescence intensity: (A): control; (B): 20 μg/ml; (C): 50 μg/ml; (D): 100 μg/ml.
