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Discriminative stimulus effects of pregnanolone administered alone (○) or after administration of various doses of flumazenil in four monkeys (subjects HE, SA, LI, and NI). Abscissa, dose in milligrams per kilogram body weight; data above V represent the effects of vehicle. Ordinate, mean (±1 S.E.M.) percentage of total responding that occurred on the midazolam lever.
