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. 2019 Aug 8;9:11409. doi: 10.1038/s41598-019-47657-9

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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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Electrostatic potential surface charge distribution in Sbi IV (a) and Ag85b (b). The helix α2 surface of Sbi IV is largely positively charged (shown in blue) whereas Ag85b is primarily negatively charged (shown in red). Ribbon diagrams coloured by secondary structure in the same relative positions as the surface models are shown for comparison on the right. All images were generated in UCSF Chimera (version 1.13.1) using the PDB accession codes 2JVH (Sbi IV) and 1F0N (Ag85b).