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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. 4 — The crystal structure of 8-mer_Δ3C. a The crystal structure of 8-mer_Δ3C is consistent with that in solution. This protein has a bowl-like structure with an outer diameter of 9 nm. b From the top view, 8-mer_Δ3C molecules assemble into 3D porous protein assemblies in the crystal. c From the side view, bowl-like 8-mer_Δ3C molecules array to form 2D protein layers. d Two salt bridges are formed between two adjacent 8-mer_Δ3C molecules having opposite orientations