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. 2015 Sep 4;12:133. doi: 10.1186/s12985-015-0366-5

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© Kai et al. 2015

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 4 — Fusion activity of the viruses. The fusion ability of the recombinant viruses was examined in DF1 cells infected at MOI of 0.001. The cells were stained with Giemsa for syncytium observation. The fusion activity was expressed as a percentage of rHerts/33 whose fusion activity was considered as 100 %