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. 2020 Sep 23;10:15493. doi: 10.1038/s41598-020-72418-4

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© The Author(s) 2020

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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Phylogenetic tree used to infer ancestral IPMDH sequences. The arrow marks the node corresponding to the position of the ancestral IPMDH proteins. Red branches indicate archaeal sequences; blue branches indicate bacterial sequences. For the complete tree, see Fig. S1. The scale bar represents 0.4 substitutions per site.