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Relative expression of Copper-Zinc superoxide dismutase (CuZnSOD), catalase (CAT) and glutathione peroxidase 1a (GPx1a) and glutamate-cysteine ligase catalytic subunit (GCLC) in the intestine of yellow catfish fed diets containing graded levels of Arg (g/kg). Data represents the means of three replicate groups of yellow catfish with 12 fish per group; error bars indicate standard error. Different letters above a bar denote significant difference (p < 0.05).
