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Glutathione turnover in erythrocytes before (0) and after 3 and 6 months of treatment with melatonin, compared with healthy controls. (A) GSH, (B) GSSG, (C) GSSG/GSH ratio, and (D) total glutathione. * p < 0.05, ** p < 0.01 and *** p < 0.001 vs. control; ‡ p < 0.05, and ‡‡‡ p < 0.001 vs. 0; † p < 0.05, and †† p < 0.01 vs. 3.
