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. 2018 Feb 12;11:35. doi: 10.1186/s13068-018-1031-1

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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. 3 — GC profiles of metabolites in different strains. a GC profile of standards. Retention times: 3S-acetoin, 3.8 min; 3R-actoin, 4.0 min; (2S, 3S)-2,3-BD, 6.4 min; (2R, 3R)-2,3-BD, 6.5 min; meso-2,3-BD, 6.8 min. b GC profile of extract of culture of X33-SD. c GC profile of extract of culture of X33-SDB. d GC profile of extract of culture of X33-SDU