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. 2012 May 7;109(21):8286–8291. doi: 10.1073/pnas.1200912109

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Fig. 2. — Anatomy of slices that retain the preBötC. Parasagittal view (top) shows nuclei that comprise the ventral respiratory column (VRC): Bötzinger complex (BötC), preBötzinger complex (preBötC), rostral and caudal ventral respiratory group (rVRG and cVRG), facial nucleus (VII), and the parafacial respiratory group (pFRG). Also shown are the compact, semicompact, and external (loose) formations of the nucleus ambiguous (cNA, scNA, and eNA). The hypoglossal nucleus (XII) is shown dorsally. The principal and medial divisions of the inferior olive (IOP and IOM), and the visible loop (IO_loop), are located, with the lateral reticular nucleus (LRN), ventral to the VRC. The axis (Top) is reproduced from brainstem atlas for newborn mice; preBötC-surface (Bottom Right) and VRC-surface (Bottom Left) slices are shown with reference images (Middle) (9).