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. 2023 Apr 24;6:450. doi: 10.1038/s42003-023-04772-8

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© The Author(s) 2023

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. 6 — Arg and Leu of peptide RLSAKP (non-protected), bound at subsites S1′ and S2′ are shown in the bond model in blue (nitrogen), red (oxygen), and cyan (carbon). D163 is shown in the bond model in blue (nitrogen), red (oxygen), and gray (carbon). Hydrogen bond is shown with a dashed line. Neighboring residues and the chlorine ion are also provided. Figures in the panel were prepared using MAIN⁵⁹ and rendered using Raster 3D⁶⁶.