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. 2017 May 25;15:105. doi: 10.1186/s12957-017-1172-x

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© The Author(s). 2017

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. 2 — PTK7 positively regulates cell proliferation in esophageal squamous tumor cells. PTK7 level was knocked down by siRNA in human esophageal squamous carcinoma cell lines, TE-5 (a) and TE-9 (b). PTK7 western blot (left panels) was performed to confirm the siRNA results. Proliferation of the knockdown (siPTK7) and the control cells (siControl) was measured by MTT assays in TE-5 and TE-9 ( PTK7 was overexpressed in both TE-5 (c) and TE-9 (d) cells, cell proliferation was measured by MTT assays. (*p < 0.05, **p < 0.01, Student’s t test)