PD	Parkinson’s Disorder
GCH1	GTP-CYCLOHYDROXYLASE 1
SPR	SEPIAPTERIN REDUCTASE
TH	TYROSINE HYDROXYLASE
MAOA	MONOAMINE OXIDASE A
NOS	NITRIC OXIDE SYNTHASE
ROS	REACTIVE OXYGEN SPECIES
BH4	TETRAHYDROBIPTERIN
MTHFR	METHYL TETRAHYDROFOLATE REDUCTASE
MTHFD1	METHYLENE TETRAHYDROFOLATE DEHYDROGENASE 1
DHFR	DIHYDROFOLATE REDUCTASE
CSF	CEREBROSPINAL FLUID
NADPH	NICOTINAMIDE ADENINE DINUCLEOTIDE PHOSPHATE
PTPS	PYRUVOYL TETRAHYDROPTERIN SYNTASE
CP	CHOROID PLEXUS
SHMT	SERINE HYDROXYMETHYL TRANSFERASE
5-MTHF	5-METHYL TETRAHYDROFOLATE
BH2	DIHYDROBIOPTERIN
AR	ALPHA REDUCTASE
CBR	CARBONYL REDUCTASE
TCA	TRICARBOXYL ACID CYCLE
THF	TETRAHYDROFOLATE
ENT2	Equilibrative Nucleoside Transporter 2
ATP	ADENOSINE TRIPHOSPHATE