TABLE 1.

Differences in the amount of key molecules of the dopaminergic system between wild-type and Go2α^−/− (knockout) mice

Molecule	Untreated	Following cocaine treatment
D1 receptor	wt = ko	wt > ko
D2 receptor	wt = ko	wt < ko
Gsα	wt > ko	wt = ko
Golfα	wt > ko	wt = ko
TH	wt > ko	wt > ko
VMAT2	wt < ko	wt < ko

wt, wild type; ko, knockout.