What amino acid works alongside iodine to synthesize the key thyroid hormones T3 and T4?
Answer
Tyrosine
The synthesis of critical thyroid hormones, specifically T3 (triiodothyronine) and T4 (thyroxine), requires the collaborative action of iodine and an amino acid called tyrosine. Tyrosine is obtained through diet and serves as the structural backbone upon which iodine molecules attach to form these regulatory hormones. Since the thyroid gland relies heavily on these hormones to govern metabolism, energy conversion, growth, and repair processes throughout the body, the presence of both iodine and tyrosine in the diet, often facilitated by consuming sea vegetables, is essential for endocrine system maintenance.

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