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. 2020 Oct 14;11:5187. doi: 10.1038/s41467-020-18830-w

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© The Author(s) 2020

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. 4 — a Cross-section of the large subunit showing the tunnel with density of the polypeptide reaching from the PTC until the beginning of the lower part of the tunnel. The constriction site is shown by a black circle and the constricted tunnel is highlighted by a black outline. b View of the branching point from inside the tunnel. The red arrow shows the exit which was formed upon deletion of H50 (orange). The black arrow shows the path of the constricted tunnel. c S. cerevisiae-like exit site is sterically hindered by protein extensions of uL22m and uL24m, shown in cartoon. d The view of the exit site showing the surrounding proteins and rRNA.