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. 2018 Nov 14;9:311. doi: 10.1186/s13287-018-1045-4

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© The Author(s). 2018

Open Access This 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. 7 — a Severity of pulmonary fibrosis evaluated by modified Ashcroft score (on the 56th day after exposure to silica suspension). b Hydroxyproline content in lung tissues of each group (on the 56th day after exposure to silica suspension). Data are presented as mean ± SD. *o < 0.05 compared with the control group, ^#p < 0.05 compared with the silica model group