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. 2019 May 2;9:6843. doi: 10.1038/s41598-019-43139-0

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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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Structures and sequence variation of N. meningitidis PilQ and PorA. (A) PilQ. Upper panel: outer membrane-spanning domain; lower panel: periplasmic domains. The model for the membrane-spanning domain was generated by I-TASSER⁷⁴ using multiple templates. The periplasmic domain was based on PDB accession 4AV2. (B) PorA. The model for PorA was generated using SWISS-MODEL⁷¹, based on PDB accession 3A2S.