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. 2020 Oct 7;10:16752. doi: 10.1038/s41598-020-73606-y

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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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Structure of N2098R. The retinal molecule and acyl chains are shown as yellow and cyan stick models, respectively. Water molecules are shown as purple spheres. (a) Crystal structure of N2098R, viewed parallel to the membrane (left panel) and from the cytoplasmic side (right panel). (b) Structure of the retinal binding and water cluster region. (c) Structure of the extracellular portion of the proton translocation pathway; the region near the putative proton efflux region is shown. Numbers indicate the distance (Å) between two atoms connected by dashed lines.