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Changes in inspiratory time (top panel), expiratory time (middle panel) and end inspiratory pause (bottom panel) elicited by injections of vehicle or morphine (5 mg/kg, i.v.) and subsequent exposure to three 15 min episodes of hypoxia (10% O2, 90% N2) each of which was followed by a 15 min period of normoxia (room-air). The first episode of hypoxia began 15 min after injection of vehicle or morphine. There were 6 rats in each group. Data are mean ± SEM.
