L-3, 5,5 '-tetraiodothyronine. Definition

Medical Definition: L-3, 5,5 '-tetraiodothyronine

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

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