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. 2016 Oct 18;6:35537. doi: 10.1038/srep35537

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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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Top row: MDCK cell infectivity assay of influenza pseudotyped particles H3_X-31/N2_X-31, H3_X-31/N2_Japan, H3_X-31/N2_MS96, H3_X-31, VSV and Δenv. Green fluorescence indicates infection of the cell. Bottom row: bright field images of the images above. Images acquired using a 20 × objective.