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. 2018 Mar 13;9:453. doi: 10.3389/fmicb.2018.00453

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Copyright © 2018 Peng, Liu, Wu, Peng, Xu, Wang, Chen, Sun, Yang, Ji and Wu.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Pathological changes of lung tissue from 6D2 infected mice. (A–F) Lung tissue from mice infected by r6D2-WT, r6D2-MA (HA), r6D2-MA (PA), r6D2-MA (PB2), r6D2-MA (PA/PB2), and r6D2-MA (HA/PA/PB2), respectively. Lung sections were subjected to hematoxylin–eosin staining and displayed at a magnification of ×200.