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ROS levels were detected by using DCFH‐DA. Cellular fluorescence intensity was significantly increased after exposure to RFR at 4 W/kg compared with the control group. **P < 0.01 compared with the control group, *P < 0.05 compared with the control group. Values are means ± SEM of three independent experiments. DCFH‐DA = dichloro‐dihydro‐fluorescein diacetate; RFR = radiofrequency radiation; ROS = reactive oxygen species; SEM = standard error of the mean.
