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. 2016 Nov 29;6:37843. doi: 10.1038/srep37843

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Copyright © 2016, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Positive immunohistochemical reactions were observed in lung sections of mice after infected with the H4 viruses, (A–D): 29-1/H4N2, MH-2/H4N6, 44-2/H4N6, 46-2/H4N6; E-H): 67-2/H4N6, 408-1/H4N6, 420-2/H4N6, 421-2/H4N6. No antigen was found in lung sections of mock mice, (I): Mock. Anti-influenza A antibody against nucleoprotein (Genscript, USA) was used for IHC staining.