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. 2011 Aug 24;13(2):79–82.

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Fig 2 — The effect of melatonin on GSH levels in rats after total cranial gamma irradiation. Data represent mean standard error of mean. (n=6 animals per group). *p<0.05 (compared to control group), **p<0.001 (compared to control group), ***p<0.05 (compared to radiated groups). Although significant differences were seen between irradiated and melatonin-treated groups in GSH concentration, we could not observe the biological effect of this antioxidant agent and concluded that these changes were not of clinical importance.