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Elicitation of gasping after administration of 30 μM methysergide (M) and 2.0 μM WB-4101 (W) to a Pet-1 mouse. C, records of integrated phrenic discharge (Phr) before drugs were given; M+W, recordings obtained 10 min after administration of methysergide and WB-4101. Phrenic discharge was reduced to occasional bursts. In the period designated by the solid horizontal bar, ischemia was induced and gasping (G) was elicited.
