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Updated: June 5, 2025
It was soon manifest that the secretion of the gland was dependent upon the iodine content for its activity. Active extracts of the thyroid like thyreoglobulin and iodothyrin were proven to contain iodine, and to become inactive when the iodine was removed. Efforts to isolate the iodine containing active principle in pure form were fruitless until the work of Kendall at the Mayo Foundation.
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