3-MT	3-methoxytyramine
5-HTP	5-hydroxytryptophan
5HIAA	5-hydroxyindolacetic acid
5HIAA	5-hydroxyindolacetic acid
AAAHs	aromatic amino acid hydroxylases
AADC	aromatic acid decarboxylase
BBB	blood–brain barrier
BH4	Tetrahydrobiopterin
CA	Catecholamines
CD	catalytic domain
CNS	central nervous system
COMT	catechol-O-methyltransferase
CSF	cerebrospinal fluid
D2R	Dopamine receptor 2
DBH	dopamine beta-hydroxylase
DOPAC	3,4-dihydroxyphenylacetic acid
DRD	dopa-responsive dystonia
ERT	enzyme replacement therapy
GTPCHI	GTP cyclohydrolase I
hATTR	hereditary transthyretin
HVA	homovanilic acid
L-DOPA	3,4-dihydroxyphenylalanine
LAT1	large neutral amino acid transporter
LNAAs	large neutral amino acids
MHPG	3-methoxy-4-hydroxyphenylethylene glycol
MN	Metanephrine
MAO-A	monoamine oxidase A
MAO-B	monoamine oxidase type B
MPHG	3-methoxy-4-hydroxyphenylethylene glycol
NMN	Normetanephrine
NP	Nanoparticle
NT5DC2	5′-nucleotidase domain-containing protein 2
OD	oligomerization domain
PAH	phenylalanine hydroxylase
PC	pharmacological chaperone
PD	Parkinson’s disorder
PKU	Phenylketonuria
PLP	pyridoxal phosphate
PM	personalized medicine
PNMT	phenylethanolamine N-methyltransferase
PP2A	protein phosphatase 2A
pSiNPs	porous silicon nanoparticles
PTPS	6-pyruvoyl tetrahydrobiopterin synthase
RD	regulatory domain
SOP	standard operating procedure
SR	sepiapterin reductase
TH	tyrosine hydroxylase
THD	tyrosine hydroxylase deficiency
TPH1	tryptophan hydroxylase 1
TPH2	tryptophan hydroxylase 2
TTR	Transthyretin
Tyr	Tyrosine
VMAT1	vesicular monoamine transporter 1
VMAT2	vesicular monoamine transporter 2
VTA	ventral tegmental area
WT	wild type