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The scavenging effect of antioxidant enzymes on free radicals in vivo. CAT = catalase; GR = glutathione reductase; GSH = reduced glutathione; GSH–Px = glutathione peroxidase; GSSG = oxidized glutathione; NADP = oxidized nicotinamide adenine dinucleotide phosphate; NADPH = reduced nicotinamide adenine dinucleotide phosphate; SOD = superoxide dismutase.
