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Effects of l-cysteine on serum catalase and SOD activity in a rat model of TBI. Catalase and SOD activity is expressed as U/ml. All experimental data are presented as a mean and a standard deviation (n = 6); all statistical analyses were performed with an ANOVA. ***P < 0.001 compared to the sham rats. ###P < 0.001, ##P < 0.01, and #P < 0.05 compared to the control rats (TBI)
