Fig. 1From: Serum concentrations of kynurenines in adult patients with attention-deficit hyperactivity disorder (ADHD): a case–control studyThe kynurenine pathway of tryptophan catabolism. INF-γ interferon gamma, TDO tryptophan 2,3-dioxygenase, IDO indole 2,3-dioxygenase, KYNU kynureninase, KAT kynurenine aminotransferase, KMO Kynurenine mono-oxygenase, PLP pyridoxal 5′-phosphate (vitamin B6), FAD flavin adenine dinucleotide (vitamin B2), NAD nicotinamide adenine dinucleotideBack to article page