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(A) Determination of the apoptotic populations of normal cells (BNL-CL2 and L-132 cells) and cancer cells (U87 and HeLa cells) Annexin V-fluorescein isothiocyanate (FITC)/propidium iodide (PI) staining and subjecting to flow cytometry in polydimethylsiloxane (PDMS) multi-channel cell chip. The cells were cultured at 1 × 105 cells/mL and treated with oleanolic acid (OA; 50 and 100 µg/mL) for 24 h. (B) Quantitation of the data shown in (A).
