3-OH-AA	3-hydroxyanthranilic acid
3-OH-AAO	3-hydroxyanthranilic acid oxygenase
3-OH-KYN	3-hydroxy-l-kynurenine
5-OH-TRP	5-hydroxy-tryptophan
5-hydroxy tryptamine	serotonin
AA	anthranilic acid
acetyl-CoA	acetyl-coenzyme A
AD	Alzheimer’s disease
AhR	aryl hydrocarbon receptor
BER	base excision repair
CSF	cerebrospinal fluid
DSB	double strand break
ETC	electron transport chain
HD	Huntington’s disease
HR	homologous recombination
IDO	indolamine-2,3-dioxygenases
IFN-α	interferon-α
IL1	interleukin-1
iNKT	invariant natural killer T cell
KAT	kynurenine aminotransferase
KMO	kynurenine-3-monooxygenase
KYNU	kynureninase
KYN	kynurenine
KYNA	kynurenic acid
LPS	lipopolysaccharides
L-TRP	l-tryptophan
MMR	mismatch repair
NAD+	nicotinamide-adenine dinucleotide
NMDA	N-methyl-d-aspartate
NMN	nicotinate mononucleotide
NER	nucleotide excision repair
NHEJ	non-homologous end joining
PA	picolinic acid
PD	Parkinson’s disease
PARG	poly(ADP-ribose) glycohydrolase
PARP	poly (ADP-ribose) polymerase
PGC-1α	oeroxisome proliferator-activated receptor-gamma (PPARγ) coactivator 1-alpha
QPRT	quinolinic acid phosphoribosyl transferase
QUIN	quinolinic acid
ROS	reactive oxygen species
SER	serotonin
SSB	single strand break
TDO	TRP-2,3-dioxygenase
TGFβ	transforming growth factor-β
TNF-α	tumour necrosis factor-α
TRP	tryptophan
XA	xanturenic acid