<prompt> Amino acid required for formation of thyroxineTryptophanTyrosineGlutamineCysteine  <response>: Metabolic role of Tyrosine Synthesis of thyroid hormones: Thyroxine T4 and triiodothyronine T3 Synthesis of catecholamines Synthesis of melanin pigment Formation of tyramine Formation of phenol and cresol Formation of tyrosine-O-sulphateRef: Textbook of medical biochemistry, MN Chatterji, 8th edition, page no: 497 