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. 2018 Jan 30;9:29. doi: 10.3389/fmicb.2018.00029

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Copyright © 2018 Ye, Su, Lin, Lai, Li, Ali, Zheng and Peng.

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 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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Alanine represses genes with antioxidant functions (A) Genes with antioxidant functions present in E. tarda, their homologues in Escherichia coli, their functions and the catalyzed reactions of the encoded enzymes. (B) Transcriptional level of genes of major classes of antioxidants. (C) SOD activity and (D) catalase activity in the presence of exogenous alanine (40 mM). (E) Transcriptional level of oxyR and crp in the presence of alanine. ^∗p < 0.05, ^∗∗p < 0.01, and ^∗∗∗p < 0.001 as determined by Student’s t-test.