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. 2019 Oct 24;20:232. doi: 10.1186/s12931-019-1195-7

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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. 3 — IgA⁺ B cells are present within TLO structures of IPF lungs. (a) Hematoxylin and eosin (h&e) staining of a control lung and IPF lung showing numerous TLOs (black arrows). (b) Pulmonary TLOs of IPF lung stained with anti-CD3 (T cells) and anti-CD20 (B-cells). (c) Representative images of staining with anti-IgG and anti-IgA. Magnification: 10x (a) and 40x (b and c)