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Phrenic and hypoglossal nerve recordings (PNA, HNA) of transection experiment 1.5 mm caudal to obex. A. Acute response to transection. B. NaCN evoked chemoreflex tachypnea prior to transection (same time scale as C). C. Absence of rhythmic PNA and HNA during NaCN evoked chemoreceptor reflex after transection.
