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Biosynthesis and Degradation of Thyroid Hormones


Iodide, which is ingested in food and water, is actively concentrated by the thyroid gland, converted to organic iodine by TPO (Thyroid Peroxidase also known as Iodide Peroxidase), and incorporated into tyrosine in intrafollicular thyroglobulin within the colloid at the basal cell surface of the thyroid follicular cell. The tyrosines are iodinated at one (Monoiodotyrosine) or two (Diiodotyrosine) sites and then coupled to form two active hormones, Thyroxine (T4, a Tetra-Iodinated Tyrosine derivative) and Triiodothyronine (T3)...




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