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. 2017 Nov 17;8:1585. doi: 10.1038/s41467-017-01702-1

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© The Author(s) 2017

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. 5 — Structure of the NADH channel entrance in the a A and b B chains of resting P450nor at ambient temperature. The 2F _o−F _c maps are shown in gray and contoured at 1.0σ. The F _o−F _c positive maps are shown in turquoise and contoured at 2.3σ. The structure factor F _c was calculated from the open form (blue Cα trace) of the NADH channel. The refined structure of the closed form is shown in orange (40% occupancy). The structures using the “Dark2” data of MC-2 are presented