Catecholamines are synthesized from
Tyrosine -------------------->DOPA ---------------->dopamine ----------------->norepinephrine ----------------->epinephrine (catecholamines)Ref: DM Vasudevan - Textbook of Biochemistry, 7th edition, page no: 235
Tryptophan
Tyrosine
Methionine
Histidine
Metabolism of protein and amino acid