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1. [(14)C]Dimethylnitrosamine was administered to rats, and the formation of free and protein-bound S-methylcysteine was investigated. 2. Very little S-methylcysteine was found in liver acid-soluble fraction, in liver protein or in urine. 3. The methylhistidines formed in liver protein were found to have largely disappeared by 6 days after injection of dimethylnitrosamine. 4. The significance of these results in the carcinogenic action of dimethylnitrosamine is discussed.

REACTION OF THE CARCINOGEN DIMETHYLNITROSAMINE WITH PROTEINS AND WITH THIOL COMPOUNDS IN THE INTACT ANIMAL