Iu E Shilov et al.
Vestnik Rossiiskoi akademii meditsinskikh nauk, (1)(1), 35-41 (2013-06-29)
The essential amino acid tryptophan is metabolized on the methoxyindole pathway to serotonin, melatonin and 5-hydroxyindoleacetic acid and on the kynurenine pathway to kynurenine and related neuroactive metabolites, including 3-hydroxykynurenine, kynurenic acid, quinolinic acid and xanthurenic acid. Kynurenine and related