Biochemistry Phenylalanine and Tyrosine metabolism Detail 59bb5d6e All of the following are tyrosine derivatives, EXCEPT A Serotonin B Melanin C Epinephrine D Thyroxine High-Yield Explanation Melanin, Catecholamines (Dopamine, Norepinephrine, Epinephrine), Thyroxine are the derivatives are tyrosine. Serotonin is a tryptophan derivative.