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. 2020 Sep 3;30(12):1127–1135. doi: 10.1038/s41422-020-00404-6

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© Center for Excellence in Molecular Cell Science, CAS 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 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 map of MlaFEDB. b Overall structure of the MlaFEDB transporter shown in cartoon. MlaD, MlaE, MlaF and MlaB are shown in light blue, wheat, actinium and pale green, respectively. c The cartoon structures of single subunit and hexameric MlaD. C-terminal α-helical bundle on top of the ring is shown. N-terminal TMs insert into the membrane. d The cartoon structures of dimer of MlaE (left), and the top view of the TMs of MlaE and MlaD (right). The surface cartoon of the hydrophobic cavity is shown in cyan. e The cartoon structure of MlaF. f The cartoon structure of MlaB.