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. 2018 Jun 25;19:126. doi: 10.1186/s12931-018-0825-9

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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. 9 — Smoking history alters TLR expression in human tracheobronchial epithelial cells (TBEC) but not macrophages. TLR3 and TLR4 mRNA expression in TBEC (a and b) and alveolar macrophages (c and d) that were not treated, or treated with LPS or Poly(I:C) (PIC) for 4 and 24 h. N = 8 donor subjects including four smokers (S) and four non-smokers (NS)