Action Potentials 2 Animals 2 Article 2 Central Nervous System Sensitization 2 Cocaine 2 Corpus Striatum 2 Dopamine 2 Dose-Response Relationship, Drug 2 Locomotion 2 Mice 2 Mice, Knockout 2 Mice, Transgenic 2 Neural Inhibition 2 Nucleus Accumbens 2 Receptors, Dopamine D2 2 action potential 2 adult 2 animal 2 animal cell 2 animal experiment 2 animal tissue 2 axon 2 brain nerve cell 2 central nervous system sensitization 2 cocaine 2 controlled study 2 corpus striatum 2 cytology 2 dopamine 2 dopamine 2 receptor 2