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Methamphetamine and cocaine are among the most commonly abused psychostimulants. Repeated injections of psychostimulants produce behavioral sensitization or augmented locomotion in rats. Behavioral(More)
Nigrostriatal (NS) dopaminergic (DA) neurons are thought to exert an inhibitory influence on striatal enkephalinergic systems through their DA D2 receptors. In order to investigate the effects of(More)