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. 2019 Oct 15;10:2374. doi: 10.3389/fmicb.2019.02374

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Copyright © 2019 Dyachkova, Chekalin and Danilenko.

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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Maximum likelihood phylogenetic tree based on concatenated protein-coding sequences of the pkb2, fn3, aaa-atp, duf58, and tgm genes of 43 representatives of various species of the Bifidobacterium genus after 10,000 bootstrap replicates. Bootstrap values higher than 70 are marked next to the respective nodes showing a robust phylogenetic reconstruction. Values of ω are specified for a class of sites with ω > 1 in those branches of the tree, in which the evidence of episodic positive selection was obtained under strict conditions. The original branch lengths are presented; the scale bar corresponds to the value of two expected substitutions for ten nucleotide sites.