Modified by multiple enzymatic steps. Packaged into lipid droplets by Golgi apparatus. Unlike peptide and catecholamine hormones, steroids are not stored, but secreted as quickly as they are synthesized. D. Thyroid hormones . Synthesized in thyroid follicular cells .
Precursor is a large globular protein called thyroglobulin .
Tyrosine residues on thyroglobulin are iodinated. Iodinated tyrosine residues are coupled to form iodothyronines. Thyroglobulin broken down to release iodothyronines as thyroid hormones. The Mechanisms of Body Function, 8th ed., 2001. Links are password-protected.