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Increased activation of µ-opioid inhibitory receptors by unilateral dialysis of 100 µM of [d-Ala2,N-MePhe4,Gly-ol]-enkephalin (DAMGO; closed circles) into the ventral respiratory column did not (P = 0.758) alter pulmonary ventilation (V̇i; A) and breathing frequency (B) compared with dialysis of mock cerebral spinal fluid (mCSF) (open circles). The black line denotes when DAMGO was dialyzed.
