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. 2017 May 12;18:91. doi: 10.1186/s12931-017-0576-z

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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. 6 — SiO₂ exposure induces MAPK9 and TGF-β1 mRNA and protein expression in co-culture system in vitro. a and b MAPK9 and TGF-β1 mRNA expression in fibroblast in SiO₂ exposure co-culture system, mRNA expression of SiO₂ treated groups is compared to control group. c and d MAPK9 protein expression was measured by IHC (magnification 100×). All values represent the mean ± SD in three separate experiments. *P < 0.05 compared with control group