behavior/neurological
• effects of D-amphetamine and LSD on both prepulse inhibition and repetitive movements are attenuated in mutants; effects of PCP on repetitive movements are attenuated
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• mutants self-administer significantly greater numbers of cocaine infusions at 0.5 mg/kg and 0.1 mg/kg doses than do wild-type
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homeostasis/metabolism
• binge cocaine administration produces increases in extracellular dopamine levels in the dorsal striatum in mutants but the increase is attenuated compared to wild-type
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