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. 2023 Feb 17;6:190. doi: 10.1038/s42003-023-04554-2

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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. 3 — a A cross-section of retinal at the SB linkage. The F(K + bR) − F(bR) difference map is shown as green and red meshes at contour levels of ±3σ. The K structures are represented as colored sticks. The ground state structure is overlaid as gray sticks. b A cross-section of retinal at the middle of the polyene backbone. c A cross-section of retinal at the β-ionone ring. d The map around Asp85. e The map around Asp212. f The map around Asp115.