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Figure 3 Transcript levels of genes encoding antioxidant enzymes copper zinc superoxide dismutase (Cu/Zn SOD) and glutathione peroxidase (GSH-Px) are increased approximately 100% after 12 weeks of physical training. The Cu/Zn SOD and GSH-Px transcript levels were determined relative to Von Willebrand factor (VWF) complementary DNA in the same preparation of reverse transcribed RNA. Open bars = pretraining; solid bars = posttraining. Data are presented mean ± SEM. *p < 0.05 versus pretraining.