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Effects of DOR gene silencing (siDOR) on the apoptosis of BEL/FU cells. (A) Flow cytometric analysis using Annexin V-fluorescein isothiocyanate double staining. (B) Histogram presenting the apoptotic rates of BEL/FU cells. Data are from three independent experiments and are presented as the mean ± standard deviation. **P<0.01, vs. siControl. DOR, δ opioid receptor; BEL/FU, BEL-7402/5-fluorouracil; PI, propidium iodide.
