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Age-dependent changes of the total superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GSH-Px), glutathione reductase (GR), and thioredoxin reductase (TR) activities in the skin of rats. Data were presented as mean ± SEM. ∗In respect to 3-month-old rats; ∗p < 0.05; ∗∗p < 0.01; ∗∗∗p < 0.001.
