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. 2021 Feb 4;12:604079. doi: 10.3389/fmicb.2021.604079

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Copyright © 2021 Jing, Liu, Wu, Li and Liu.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The influence of various cpxA mutations on the expression levels of the efflux pump AcrAB-TolC. (A) Relative mRNA expression levels of the efflux pump genes acrB and tolC. (B) Relative mRNA expression levels of the transcription factor genes marA, soxS, and ramA. The expression level of each mRNA in strain JS represents one-fold. Data were normalized to rpoD expression levels. Bars represent means ± standard deviations. **, P < 0.01.