10R	10-repeat
4R	4-repeat
7R	7-repeat
9R	9-repeat
ADHD	Attention Deficit Hyperactivity Disorder
ANKK1	Ankyrin repeat and kinase domain containing 1
cAMP	Cyclic Adenosine Monophosphate
COMT	Catechol-O-methyltransferase
D1–D5	Dopamine receptor type 1–5
D2L	Long isoform of the dopamine D2 receptor
D2S	Short isoform of the dopamine D2 receptor
DAT1	Dopamine transporter
DBH	Dopamine Beta-Hydroxylase
DRD1	Dopamine D1 receptor gene
DRD2	Dopamine D2 receptor gene
DRD3	Dopamine D3 receptor gene
DRD4	Dopamine D4 receptor gene
DRD5	Dopamine D5 receptor gene
EEG	Electroencephalography
fMRI	Functional magnetic resonance imaging
L-DOPA	L-3,4-dihydroxyphenylalanine
NEO-FFI	NEO Five Factor Inventory
PET	Positron emission tomography
SLC6A3	Solute Carrier Family 6 Member 3
SN	Substantia Nigra
SNP	Single Nucleotide Polymorphism
TH	Tyrosine Hydroxylase
Val158Met	Valine-to-methionine substitution
VNTR	Variable Number Tandem Repeats
VTA	Ventral Tegmental Area