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Effects of pretreatment with the partial nicotinic agonist varenicline on d-MA-like responding produced by (−)-nicotine in rats trained to discriminate 0.3 mg/kg d-MA from saline. Ordinates are as in Fig. 1. Abscissae show dose of (−)-nicotine (mg/kg; log scale). See Fig. 1 for other details. Each data point represents all subjects tested (at least three to seven rats) at each dose.
