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Thyroxine is a thyroid hormone that is formed by the condensation of two molecules of the amino acid tyrosine. Also called T4 hormone for tetra-iodothyronine, the thyroxine molecule has four diode atoms and has a structure similar to that of another thyroid hormone: tri-iodothyronine or T3, which has three diode atoms. Thyroxine is produced by the thyroid follicles. Thyroid hormones act on a large number of organs. They tend to increase basal metabolic rate and oxygen consumption, which helps produce heat. Thyroid hormones are involved in growth.