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CAT activity levels in study subgroups after quotient normalization against given day control group (relative values). Significant increase in CAT activity level was observed in noise-exposed group on the 7th day post-exposure (asterisk 1). Significant difference in CAT activity was observed on day 7 in d-met 200 mg/kg and 400 mg/kg groups when compared with noise-exposed group (asterisk 2)
