Abstract
After the administration of 3-methylcholanthrene to adult male rats, activities of hepatic UDP-glucuronosyltransferase towards six from a group of 12 substrates were stimulated by 250-350%. Activities towards the remaining six substrates were unaffected. Conversely, after phenobarbital administration, activities formerly stimulated by 3-methylcholanthrene remained unchanged, and the other six activities were stimulated by 160-280%. The relationship of these two groups of transferase activities to other evidence suggesting the same heterogeneity of the enzyme is discussed.
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