1 Thyroxine (T4) and Triiodothyronine (T3) . 2  Thyroxine (T4) is the key hormone produced in the thyroid gland. 3  Low levels of T4 produce hypothyroidism, and high levels produce hyperthyroidism. 4  Thyroxine converts to triiodothyronine (T3), which is a more biologically active hormone.
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