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. 2016 Aug 2;16:581. doi: 10.1186/s12885-016-2634-1

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© The Author(s). 2016

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. 3 — Immunohistochemical staining of STEM cryo-sections at day 15 (left panel): (a) fibronectin, (b) CK-18, (c) vimentin, and (d) CD-31, and (right panel) 2-D tri-culture controls. A549 population indicated by red arrowhead, HPMEC population indicated by green arrowhead, and MSC population indicated by blue arrowhead. Scale bar for low magnification images – 100 μm, scale bar for inset – 50 μm. Negative controls are shown in Additional file 1: Figure S1