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Changes in frequency of breathing (top panel), tidal volume (middle panel) and minute ventilation (lower panel) elicited by injections of vehicle or morphine (10 mg/kg, i.v.) and subsequent exposure to Hypoxia-Hypercapnia (air flow off) and return to room-air (air flow on). The data are presented as mean ± SEM. There were 6 rats in each group.
