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. 2018 Jul 9;19:132. doi: 10.1186/s12931-018-0838-4

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© The Author(s). 2018

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 — Staining of γ-H2A.X in regions with low surface density and high (a) collagen 1 or (b) elastin staining. More extensive γ-H2A.X staining (red) was present in the regions with high elastin content. The bronchial epithelium had extensive γ-H2A.X positive staining in the IPF group, primarily in the airway epithelial cells. c Airway wall from a control subject. d Airway wall from a subject with IPF. Scale Bar = 100 μm