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Survival of whole body irradiated rats pretreated with melatonin. Con: Control group, Veh: Vehicle only group, Mel: Melatonin only group, Rad: Radiation only group, Veh + Rad: Treated with vehicle and exposed to 10 Gy radiation, and Mel + Rad: Treated with 100 mg/kg melatonin before exposure to 10 Gy radiation.
