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. 2017 Feb 7;17(Suppl 1):12. doi: 10.1186/s12862-016-0865-z

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© The Author(s). 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Promoter structure in σ⁷⁰ family: The promoter organization for RpoD (E. coli RpoD in the upper part of the figure) and ECF group (E. coli σ^E and B. subtilis σ^W in the lower part of the figure) is shown; the promoter elements implicated in dsDNA interactions with σ factor are shown in green/black, and shaded with the red rectangle; the promoter elements implicated in ssDNA interactions with σ factor are shown in red, and shaded with the green rectangle