Amine hormones are synthesised from which amino acids?

1. Amine hormones come from a single amino acid that has been modified, usually by losing its carboxyl group. 2. Only two amino acids serve as the starting material, tryptophan and tyrosine. 3. Melatonin is the tryptophan derivative, while thyroid hormones and the catecholamines come from tyrosine. 4. Glycine and cysteine build ordinary proteins here and start no amine hormone. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 17 "The Endocrine System", section 17.2 Hormones_