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Specific activities of biotransformation enzymes with conjugative activity in rat liver. The white column represents young (6-week-old) rats, and the hatched column indicates old (21-month-old) rats. Values are expressed as mean ± SD (six animals per age group) (*data with P < 0.01, Student's t-test). GST = glutathione S-transferase; UGT = UDP-glucuronosyl transferase.
