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. 2016 Mar 3;7(3):e148. doi: 10.1038/ctg.2016.8

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Copyright © 2016 American College of Gastroenterology

Clinical and Translational Gastroenterology is an open-access journal published by Nature Publishing Group. This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/4.0/

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Photomicrographs of anal squamous cell carcinoma. (a) Hematoxylin and eosin stain, × 100; (b) immunostain for p16 shows overexpression pattern consistent with transcriptionally active human papillomavirus.