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. 2019 Nov 4;19:1037. doi: 10.1186/s12885-019-6251-7

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© The Author(s). 2019

Open AccessThis 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 — SMAD4 expression status in pancreatic ductal adenocarcinoma. Representative images of negative (a) and positive (b) expression of SMAD4 in carcinoma tissues. Representative images of negative (c) and positive (d) expression of SMAD4 in adjacent tissues