Fig. 1From: Altered kynurenine pathway metabolites in serum of chronic migraine patientsThe Kynurenine Pathway of Tryptophan metabolism. The kynurenine pathway. (1.a) Indoleamine-pyrrole 2,3-dioxygenase; (1.b) tryptophan 2,3-dioxygenase; (2) arylamine formamidase; (3) kynurenine aminotransferase; (4) kynurenine 3-hydroxylase; (5) kynureninase; (6) 3-hydroxyanthranilic acid 3,4-dioxygenaseBack to article page