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Summary diagram of the spinal and brainstem relay pathways involved in coupling respiratory rhythm generation to the rhythmic activation of cervical and lumbosacral proprioceptive inputs during locomotion. See text for further explanation. Exp, expiration; insp, inspiration; pBötC, pre-Bötzinger complex; pFRG, parafacial respiratory group; PB/KF, parabrachial/Kölliker-Fuse nuclei; LC, locus ceruleus.
