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. 2019 May 29;10:1210. doi: 10.3389/fmicb.2019.01210

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Copyright © 2019 Ospino, Kojima and Fukui.

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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Arrangement of the arx gene cluster found in the genomes. Arrows with different colors represent the following genes: yellow for arxAB, green for arxC, blue for arxD, gold for arxB2, peach for arxX, coral for arxS, purple for arxR, and gray for hypothetical proteins. The number of genomes for each class-level taxonomy of bacteria is shown in parentheses. Name of organisms with ARX of group 1, group 2, and group 3 are shown in blue, green and red respectively. Names with black square correspond to organism reported as arx-arsenite-oxidizing bacterium, including strain M52. Names with black triangle represent the metagenome-assembled genomes (MAGs). Black star represents the genes encoding products annotated as partial protein. Names of organisms affiliated to the Order Oceanospirillum are enclosed in a gray dashed square. The conserved arxABC genes are highlighted in beige color.