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. 2022 Mar 17;16:858617. doi: 10.3389/fncel.2022.858617

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Copyright © 2022 Park, Cho, Kim, Kim and Bae.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Light micrographs showing the tracer injection site in the rostral part of the nucleus of the solitary tract (rNST; A) and anterogradely labeled axon terminals in the parabrachial nucleus (PBN; B,C) and the reticular formation (RF; D–F). (A) The horseradish peroxidase (HRP) injection, outlined with a dashed line, is confined to the rNST. (B–F) Dark HRP-labeled axons and terminals (arrowheads) are observed in the central medial subnucleus of the PBN (B,C) and the medullary RF (D–F). Panel (C) is the enlargement of the square in panel (B). Panels (E,F) are enlargements of the medial and lateral squares, respectively, in panel (D). Sp5, spinal trigeminal nucleus; Vmo, trigeminal motor nucleus; 7, facial nucleus. Scale bars, 200 μm in panels (A,B,D) and 20 μm in panels (C,E,F).