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. 2019 Feb 15;10:778. doi: 10.1038/s41467-019-08788-9

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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. 5 — The construction of two proteins through different mechanisms. One polypeptide of mutant Δ3C folds into three kinds of subunits H_α, H_β, and H_γ, and their difference in structure is highlighted in red and yellow; subsequently, the first two types of subunits at a ratio of 1:1 co-assemble into 8-mer_Δ3C, while 24 of the third subunits assemble into a 24-mer_Δ3C protein nanocage