Question

iodine is the main part of this hormones​

Answer 1

Iodine is the main part of Thyroid hormones .

Answer 2

In vertebrate biology, iodine's primary function is as a constituent of the thyroid hormones, thyroxine (T4) and triiodothyronine (T3). These molecules are made from addition-condensation products of the amino acid tyrosine, and are stored prior to release in an iodine-containing protein called thyroglobulin.