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. 2017 Aug 1;14:28. doi: 10.1186/s12989-017-0209-1

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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. 5 — Impact of CuO NP, CuO MP and CuCl₂ on gene expression of inflammation marker IL8. BEAS-2B cells (a) or A549 cells (b) were treated with the different copper compounds for 24 h. Shown are linear fold changes of the relative gene expression from mean values of four determinations derived from two independent experiments ± SD. 20 μg/mL CuO are equal to 252 μM Cu²⁺. Please note the different scaling of the y-axis