For behavior, Cocaine HCl (National Institute on Drug Abuse Drug Supply Program, Bethesda, MD) and phenmetrazine hemifumarate (RTI International, Research Triangle Park, NC) were dissolved in sterile saline; norbinaltorphimine (nBNI) was dissolved in sterile injectable water. For fast-scan cyclic voltammetry, the KOR agonist U50,488 (National Institute on Drug Abuse Drug Supply Program, Bethesda, MD) and Cocaine HCl were dissolved in deionized water.
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