Quantitative changes in thyroidal I '~' can be measured with a sensitive scintillation counter, mounted on a flexible arm which is attached to a holder that immobilizes the neck and head of the animal. One gram of thiouracil per 100 lb. inhibits reutilization of I ~ from metabolized thyroid hormone. The daily secretion rate of individual animals can be measured in terms of L-thyroxine. Editor.
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Pipes et al. (1957) studied this question.
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