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. 2018 Jun 27;8:9776. doi: 10.1038/s41598-018-28077-7

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Side-by-side interactions between two hexamers from the energy-minimized VP40 cylindrical matrix of (A) Model 21 hexamers and (B) Model 54(b). For both (A,B), hexamer-1 is colored orange and hexamer-2 is colored in blue. The residues that form hydrogen bonds and salt-bridges at the hexamer-hexamer interfaces are shown in the boxes. Red and green dashed lines respectively show the hydrogen bonds and salt-bridges.