Animals 2 Autoreceptors 2 Cocaine 2 Cocaine-Related Disorders 2 Conditioning, Operant 2 Cues 2 DRD2 protein, mouse 2 Disease Models, Animal 2 Dopamine 2 Dopamine Uptake Inhibitors 2 Feedback, Physiological Male 2 Mesencephalon 2 Mice, Knockout 2 Neural Inhibition 2 Neurons 2 Receptors, Dopamine D2 2 Self Administration 2 animal 2 association 2 autoreceptor 2 cocaine 2 cocaine dependence 2 disease model 2 dopamine 2 dopamine 2 receptor 2 dopamine uptake inhibitor 2 drug effects 2 drug self administration 2 feedback system 2