Abstract
Summary
Analysis of the livers of white rats for arginase activity after the administration of thyroxine have been made. The data show that, although the hormone in the dosage used caused male rats to lose body weight, the arginase content of the livers remained unchanged. Livers from pregnant and nonpregnant female rats given thyroxine contained quantities of the enzyme comparable to those found after feeding diets high in protein or after long fasting. Possible relations of these changes in enzyme concentration to protein catabolism are discussed.
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