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. 2020 Feb 4;10:1790. doi: 10.1038/s41598-020-58599-y

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© The Author(s) 2020

Open Access This 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Representative images of H&E staining of lung tissue in the different groups (magnification, 200×), (a) the control group, the alveolar structure of the control group was intact, and there was no edema in the alveolar wall and no inflammatory cell infiltration in the lung parenchyma; (b) the PQ group, a large number of inflammatory cells infiltrated, with obvious bleeding and clear membrane formation in the alveolar cavity; (c) the HMH group, The alveolar structure of the HMH group was slightly damaged with a small amount of inflammatory cells exudation and hemorrhage.