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Effects of the cumulatively administered nicotinic agonists, (−)-nicotine, (+) epibatidine, (−) epibatidine, isoarecolone, anabaseine, and varenicline in rats trained to discriminate 0.3 mg/kg d-MA from saline. Ordinates and abscissae are as in Fig. 1. Each data point represents all subjects tested (at least five to seven rats) at each dose.
