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. 2018 May 11;18:27. doi: 10.1186/s12896-018-0441-2

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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. 6 — VB₁₂ concentration of Sm320 mutants obtained with ARTP treatments. “W” indicates the wild-type strain of S. meliloti with a VB₁₂ content of 108 mg/L in a 24-well deep plate at 30 °C for 7 d. The solid line indicates the original strain, and the dotted line indicates the position where the VB₁₂ content increased 10% compared with the original strain. Error bars show the means of three independent fermentation cultures for each strain by HPLC analysis