Abstract
Administration of hepatocarcinogens to rats results in an increase in tRNA methyltransferase activity in the target tissues. Ethionine is active as a carcinogen only in female rats and only in females is this increase in enzyme activity seen. However, ethionine also causes the formation of methyl-deficient tRNA in the liver. Other hepatocarcinogens do not do this. Ethionine is equally effective in this action in males and females. Thus, the two actions of ethionine are completely separable, and the methyl-deficiency of tRNA is caused by an activity not identical with the carcinogenic one.
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