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Substitution of the muscarinic receptor antagonists scopolamine or methylscopolamine. Abscissae, drug dose in mg/kg; “V” indicates vehicle. Ordinates, percentage cocaine-appropriate responses (top); response rate in responses per second (bottom). Data are group means ± S.E.M.; n = 8, with the exception of 56 mg/kg methylscopolamine, n = 5.
