radioactive thyroxine

(redirected from labeled thyroxine)

ra·di·o·ac·tive thy·rox·ine

thyroxine in which a radioisotope of iodine (125I or 131I) is incorporated into its molecule; used in experiments tracing the metabolism of thyroxine.
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Therefore, the absolute recoveries are not critical because it is the ratio of unlabeled to labeled thyroxine that is measured.