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. 2021 Oct 5;11:19775. doi: 10.1038/s41598-021-99255-3

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© The Author(s) 2021

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Arr phylogeny generated by the maximum likelihood method. The blue (clade I) and yellow (clade II) branches denote the two main clades. Some sub-clades of clade II are highlighted. Arr sequences functionally verified by this study and other studies are labeled green and red, respectively. Bootstrap values above 50 are shown. The outer color strips indicate the bacterial phylum of the sequence. The presence of colored circles beside the strips indicates whether the sequence has been identified in a mobile element. Reference sequences are ticked in red and have been functionally characterized.