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Effects of dietary selenium yeast and tea polyphenols on the activity and mRNA expression of antioxidant enzyme GPx (A,C) and CAT (B,D) in the liver of Wuchang bream before and after acute ammonia exposure. Data expressed as means ± SE (n = 5). Asterisks indicate significant differences between three treated groups and control group at the same time point (p < 0.05). Hash symbols indicate significant differences at the same group between before and after ammonia exposure (p < 0.05).
