2-AG	2-Arachidonoylglycerol
AEA	N-arachidonoylethanolamine
CB1KO	Cannabinoid type 1 receptor knock out
CB1R	Type 1 cannabinoid receptor
ECS	Endocannabinoid signaling
FAAH	Fatty acid amide hydrolase
FAAHKO	Fatty acid amide hydrolase knock out
FR	Fixed ratio
mGluR5	Metabotropic glutamate type 5
OSS	Operant sensation seeking
PR	Progressive ratio
SNP	Single nucleotide polymorphism
VTA	Ventral tegmental area
WT	Wild type