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. 2016 Jan 14;17:53. doi: 10.1186/s12864-016-2380-4

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© Hiraoka et al. 2016

Open Access This 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 — Growth curves of the Arthrobacter strains at different iron concentrations. Growth was measured as optical density values at 660 nm in modified MM9 medium containing different concentrations of iron (III): 0.0, 0.1, 1, and 10 μM. Growth curves of Arthrobacter sp. Hiyo1 (a), Arthrobacter sp. Hiyo8 (b), and A. phenanthrenivorans Sphe3 (c) are shown. Growth curves of Hiyo4 and Hiyo6, which showed very weak growth in the modified MM9 medium, are displayed in Additional file 4