Quinolinic AcidQuinolinic AcidsTryptophanKynurenine3-Hydroxyanthranilate 3,4-DioxygenaseTryptophan Oxygenase3-Hydroxyanthranilic AcidPentosyltransferasesKynurenine 3-MonooxygenaseNeurotoxinsNicotinic AcidsHarmineKynurenic AcidNiacinTryptophan SynthaseIndoleamine-Pyrrole 2,3,-DioxygenaseTryptophan HydroxylaseNADCorpus StriatumTriosesortho-AminobenzoatesHydroxyindoleacetic AcidPicolinic AcidsBrainHuntington DiseaseConvulsantsAspartic Acid2-Amino-5-phosphonovalerateDicarboxylic Acids