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dB2 axonal projections. A schematic sagittal section of the main respiratory and vestibular circuits of dB2 subclass. dB2-derived pFRG or LVN nuclei (purple circles) are shown to project axons (green lines) to the hindbrain preBötC nuclei or to descend toward the spinal cord motor neurons (green circles). pFRG/RTN, parafacial respiratory group/reticulotegmental nucleus; LVN-lateral vestibular nucleus; preBötC-pre Bötcinger.
