1st product of tryptophan Catabolism
Kynurenine is formed from tryptophan in presence of enzyme tryptophan pyrrolaseRef: DM Vasudevan - Textbook of Biochemistry, 7th edition, page no: 239, fig 18.8
Kynurenine
Xantheurenic acid
Bradykinin
Melatonin
Metabolism of protein and amino acid