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. 2021 Oct 22;45(2):768–779. doi: 10.1007/s10753-021-01582-0

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — a Mast cell density was higher in fibrotic areas of stable idiopathic pulmonary fibrosis (IPF) patients compared with acute exacerbation of IPF (AE-IPF) patients or normal controls. b Mast cell density was higher in never or ex-smokers than in current smokers. c High mast cell density was associated with a high lung diffusion capacity for carbon monoxide (DLCO).