T4

Definition / meaning of T4

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

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Source(s):

The Web site of the National Cancer Institute (http://www.cancer.gov/)

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