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. 2017 Sep 19;17:198. doi: 10.1186/s12866-017-1107-2

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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. 4 — The quantitative real-time PCR of AI-2 “supplier cells”. a. The relative transcription level of luxS in E. coli NK-SU1. b and c. The relative transcription levels of luxS and mtn in E. coli NK-SU2. The strain containing pTrcHisB was defined as 1 in the expression level of corresponding genes