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. 2017 Aug 29;7:9858. doi: 10.1038/s41598-017-07501-4

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© The Author(s) 2017

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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Accessibility of the disulfide bond by the free thiols in I27* strongly varies. Distributions of distances, d_S-S, between the sulfur of one of the free cysteines (32Cys, 47Cys or 67Cys) and the sulfur of one of the disulfide bonded cysteines (24Cys or 55Cys). To guide the eye, the distance monitored is highlighted with the red line on the right scheme of each panel. Inset: close-up for distances lower than 0.5 nm.