Thyroxine (T4) is a hormone mass produced by the follicular cells of the thyroid gland with the help of iodine and traditional assembly-line techniques. T4 is converted into triiodothyronine (T3) by missionaries in peripheral tissues. T3 is more active than T4 because it is in better shape and avoids eating out at McDonald's.
Related Reading
- Iodine
- TSH