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. 2017 Sep 25;14:185. doi: 10.1186/s12985-017-0851-0

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© The Author(s). 2017

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. 2 — Effect of different regions of the F* protein on membrane fusion. a Induction of syncytium formation by different regions between F48-F* and La-F* in BHK-21 cells when co-transfected with F48-HN. Schematic diagram of each construct with substituted regions in F48-F* is shown at the top of each picture. b Quantitative analysis of syncytia in (a). c Identification of region 449–499 of HR2 in triggering syncytium formation. d Quantitative analysis of the syncytia in (c). Statistical significance is designated with lowercase letters (P < 0.05) or capital letters (P < 0.01)