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. 2023 Sep 14;8(10):1834–1845. doi: 10.1038/s41564-023-01469-w

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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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Extended Data Fig. 4 — Stereograms showing sections of the cryo-EM density for regions of the whole-ribosome map (a-d) and SSU head map (e). a Representative section in the vicinity of G146 within the L50 rRNA clearly shows the difference between adenine and guanine bases. b Density peaks are modelled as Mg²⁺ ions on the basis of short (2.0 - 2.1 Å) coordinating distances to oxygen ligands. c K⁺ ions are assigned on the basis of longer coordinating distances (2.6 - 2.9 Å) which may include nitrogen ligands. d-e Zn²⁺ ions modelled in eL40 and eS31 chains.