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. 2019 Dec 16;19:369. doi: 10.1186/s12906-019-2790-3

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© The Author(s). 2019

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. 4 — Effects of PM_2.5 extracts on the mRNA expression of inflammatory cytokines in RAW264.7 cells. After 18 h, mRNA expression of (a) TNF-α and (b) IL-6 in WEP (200 μg/mL)-treated RAW264.7 cells and of (c) TNF-α and (d) IL-6 in OEP (100 μg/mL)-treated RAW264.7 cells. * < 0.05, ** < 0.01 vs. control.