Abstract

The total amount of I131-containing compounds excreted in the urine of the dehepatized dog receiving either radioactive thyroxine or triiodothyronine is similar to that of the normal dog receiving similar injections. The important role of the liver in the deiodination of thyroxine and triiodothyronine is indicated by the failure of the liverless animal to convert these compounds to inorganic iodide as completely as does the normal dog. Only a small percentage of the I131 compounds excreted by the liverless dog appears as inorganic iodide. The most abundant iodine compound in the urine of the dehepatized dog is a conjugate of thyroxine when thyroxine is injected, and an unidentified compound, b, when triiodothyronine is injected.

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