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He obtained it as a white, finely crystalline, odorless and tasteless substance, heat stable, and analyzable. The free form separates as a sheaf of fine needles. Kendall at first called it the a-iodine compound, then named it thyroxin. There are other internal secretions of the thyroid, with a function of their own, that have no iodine. But they are secondary, and obscure.
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