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. 2019 May 30;10:2366. doi: 10.1038/s41467-019-10272-3

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© The Author(s) 2019

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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Fig. 2 — Structure of the mature capsid. a Structure of the mature virion major capsid protein gp8. Top: a schematic diagram showing the polypeptide chain of a gp8 monomer; bottom: a ribbon diagram of a gp8 monomer structure in a pentameric capsomer. The structural domains of gp8 are shown in yellow (N-helix), cyan (HK97-N arm), red (HK97-E loop), green (HK97-P), blue (HK97-A), and magenta (C-Ig). b Structural superposition of the ϕ29 HK97 domain (blue) and the HK97 capsid protein (red). c Top and side view ribbon diagrams of a pentameric capsomer and a hexameric capsomer. The structural domains of two gp8 monomers in the pentameric capsomer and three gp8 monomers in the hexameric capsomer are colored in the same manner as in a. The scale bar represents 5 nm. d Structural superposition of a pentameric capsomer monomer (orange) and a hexameric capsomer monomer (green)