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. 2017 Jun 26;7:4252. doi: 10.1038/s41598-017-04606-8

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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The transcriptional analysis (Ct values) of related genes. (A) Transcription levels of genes in the suf-momL operon with (black) or without (gray) the iron-chelating agent 2,2′-dipyridyl. (B) Transcription levels of suf-momL genes in iron-deficient condition with (black) or without indole (transparent). (C) indole-induced transcriptional change in H₂O₂ condition (black, with indole; transparent, without indole). (D) The effects of indole on a series of suf regulators. Error bars represent the standard deviations of three replicates. For statistical analysis, ***/**/* means P < 0.001, P < 0.01, and P < 0.05, respectively.