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. 2019 Mar 8;9:3947. doi: 10.1038/s41598-019-40418-8

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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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Alignment of Peptide 920 and peptide CR20. The two peptides fold slightly different. Peptide 920 (PDB ID: 2AQ9) carbons are colored in yellow, oxygens in red and nitrogens in blue. Peptide CR20 carbons are colored in green, oxygens in red and nitrogens in blue. The model on the right is rotated 180°, showing the rear view of the model on the left.