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. 2017 May 26;12:13. doi: 10.1186/s12995-017-0158-5

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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 — Histopathological staining of long-term cultured human PCLS. Representative pictures of human PCLS stained at days 1, 7 and 15 post preparation. The pictures show an overview of PCLS at different time points (a, d & g; left row), close-up pictures of alveolar regions with alveolar macrophages (b, e & h; arrow; middle row, 40× magnification) and close-up pictures of larger airways with bronchiolar epithelium (c, f & i; arrows; right row, 20× magnification)