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. 2017 Oct 30;7:14296. doi: 10.1038/s41598-017-14512-8

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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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Details of the Nb9-BtuF interface. Illustrated are the interactions of BtuF with CDR1 (A), CDR2 (B), CDR3 N-terminal part (C) and CDR3 C-terminal part (D). BtuF is shown in blue and the CDR regions are colored yellow (CDR1), magenta (CDR2) and salmon (CDR3). Oxygen and nitrogen are shown in red and blue. Water molecules are indicated with red spheres. Shown is the sigma A-weighed 2Fo-Fc electron density map contoured at 1σ.