title: Estimation of the tryptophan metabolites xanthurenic acid, 3-hydroxykynurenine and kynurenine.
mesh_terms: D003124:Colorimetry; D003624:Darkness; D004355:Drug Stability; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents; D007737:Kynurenine / Q000032:analysis*; D008722:Methods; D010084:Oxidation-Reduction; D014364:Tryptophan / Q000378:metabolism; D014977:Xanthurenates / Q000032:analysis*
chemical_list: D007202:Indicators and Reagents; D014977:Xanthurenates; D007737:Kynurenine; D014364:Tryptophan