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. 2023 Jul 20;14:4365. doi: 10.1038/s41467-023-40041-2

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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. 2 — a Cryo-EM density maps of the HcKCR1 and HcCCR homotrimers viewed from the membrane plane. Protomers are colored in magenta, green, and yellow for HcKCR1, and in blue, orange, and turquoise for HcCCR, respectively. b Structure models viewed from the membrane plane (upper) and intracellular side (lower) with all-trans-retinal shown in red. In one protomer of HcKCR1 trimer helices are shown in different colors and labelled to show the order of transmembrane helices. c Interprotomer connecting residues observed in the trimeric configuration.