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. 2018 Aug 28;17:132. doi: 10.1186/s12934-018-0980-1

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© The Author(s) 2018

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 — Scheme of anaerobic glucose metabolism in E. coli. Shown are reactions involved in anaerobic glucose metabolism. Only reactions important for the study at hand are shown. Deletions present in all mutant strains are marked by red crosses. Grey arrows indicate that the respective fermentation products are absent or strongly reduced in the mutant strains. The blue arrows marks the Glc-PTS that is present in some of of the strains. The red arrow indicates the reaction catlyzed by Pck, while the green arrow indicates the reaction of the Ppc. ATP and NAD are not show in the figure with exeption of the ATP gained by Pck