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Number of injections across the first 5 sessions of treatment with the minimally effective dose of MPEP (a, left) or dizocilpine (b, right) in combination with cocaine and compared with number of injections across the first 5 sessions of saline availability (filled circles). Points are means (± SEM) based on data from groups of 4 monkeys. Points above “SA” represent the mean injections/session delivered during cocaine self-administration in the absence of drug pretreatment.
