L-3,5,5’-tetraiodothyronine
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A hormone that is made by the thyroid gland and contains iodine. L-3,5,5’-tetraiodothyronine increases the rate of chemical reactions in cells and helps control growth and development. L-3,5,5’-tetraiodothyronine can also be made in the laboratory and is used to treat thyroid disorders. Also called thyroxine, T4, and thyroxin.