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. 2017 Sep 18;8(9):688–696. doi: 10.5312/wjo.v8.i9.688

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©The Author(s) 2017. Published by Baishideng Publishing Group Inc. All rights reserved.

Open-Access: This article is an open-access article which was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/

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Fragments of canine Pn semithin sections. WA30, М-group. Toluidine blue stain. A: Normal condition of artery in epineurium; B: Epineural artery with closed lumen. Magnification 1250 ×.