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. 2017 Feb 23;18:40. doi: 10.1186/s12931-017-0522-0

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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. 3 — Analyses of non-polarized alveolar macrophages (iNOS⁻ and CD206⁻) in the study cohort. The percentage of non-polarized alveolar macrophages (iNOS⁻CD206⁻) was high in donors and non-smokers and decreased progressively with smoking and COPD severity. Bottom and top of each box plot, 25^th and 75^th percentiles; solid line, median; brackets, 10^th and 90^th percentiles