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. 2019 Apr 25;7:61. doi: 10.1186/s40478-019-0717-3

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© The Author(s). 2019

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Photomicrograph illustrating the hippocampal CA2 subfield. The CA2 region was defined as the pyramidal cell layer parallel to the boundaries set by the ends of the granule cells of the external limbs of the dentate gyrus