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. 2018 Apr 3;8:5486. doi: 10.1038/s41598-018-23827-z

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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A6d and A6v subdivisions (upper pictures) and A7 division (lower pictures). A6d is entirely restricted to the PAG and medial to the bc, while A6v is located just outside the PAG, ventro-lateral to the A6d and medial to the bc. A6d and A6v are separated by bundles of nerve fibres belonging to mrN5. A7 is located in the pontine tegmentum, ventral to A6. Atlantic spotted dolphin, Stenella frontalis. TH free-floating immunolabelling, counterstained with thionine. bc, brachium conjunctivum; mrN5, mesencephalic root of the trigeminal nerve.