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Changes in inspiratory and expiratory motor output as well as in the activity of inspiratory rostral ventral respiratory group (VRG) neurons in response to 15 nl of 160 mM D,L-homocysteic acid (DLH) injected (filled bar) into the caudal VRG (cVRG). Anaesthetized, paralyzed, vagotomized and artificially ventilated cats. Modified from Bongianni et al. 1994.
