Quinolinic AcidQuinolinic AcidsKynurenine3-Hydroxyanthranilate 3,4-Dioxygenase3-Hydroxyanthranilic AcidPentosyltransferasesTryptophan OxygenaseTryptophanNeurotoxinsKynurenine 3-MonooxygenaseNicotinic AcidsHarmineKynurenic AcidReceptors, N-Methyl-D-AspartateNiacinN-Methylaspartate2-Amino-5-phosphonovalerateCorpus StriatumTriosesNADIndoleamine-Pyrrole 2,3,-DioxygenaseHuntington DiseaseConvulsantsPicolinic AcidsBrainExcitatory Amino Acid AntagonistsAspartic AcidDicarboxylic Acids