AA	anthranilic acid
ACMSD	2-amino-3-carboxymuconate-6-semialdehyde decarboxylase
AD	Alzheimer’s disease
BBB	blood–brain barrier
CNS	central nervous system
IDOs	indoleamine 2,3-dioxygenases
3-HAA	3-hydroxyanthranilic acid
3-HK	3-hydroxy-L-kynurenine
3-HAO	3-hydroxyanthranilate oxidase
KAT	kynurenine aminotransferase
KMO	kynurenine 3-monooxygenase
KYN	kynurenine
KYNA	kynurenic acid
KYNU	kynureninase
MK-801	1-methyl-8-azabicyclo[3.2.1]octane
NADH	nicotinamide adenine dinucleotide + hydrogen
N-fKYN	N-formyl-kynurenine
NMDA	N-methyl-D-aspartic acid
PA	picolinic acid
PD	Parkinson’s disease
QPRT	quinolinate phosphoribosyltransferase
QUIN	quinolinic acid
SZR-72	N-(2-(dimethylamino)ethyl)-4-oxo-1,4-dihydroquinoline-2-carboxamide
SZR-104	N-(2-(dimethylamino)ethyl)-3-(morpholinomethyl)-4-oxo-1,4-dihydroquinoline-2-carboxamide
SZRG-21	N-(2-(dimethylamino)ethyl)-3-methyl-4-oxo-1,4-dihydroquinoline-2-carboxamide
TDO	tryptophan 2,3-dioxygenase
Trp	tryptophan
XA	xanthurenic acid