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. 2022 Aug 25;23(Suppl 6):558. doi: 10.1186/s12864-022-08796-y

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© The Author(s) 2022

Open AccessThis 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/. 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 in a credit line to the data.

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Fig. 5 — Distribution of various regulatory mechanisms for histidine metabolism genes among analyzed Firmicutes species. The maximum likelihood phylogenetic tree of Firmicutes species was constructed by MEGA X based on concatenated sequences of ribosomal proteins from the analyzed genomes. Colored bars show the occurrence of specific regulatory interactions in each species according to legend and Additional file 2. The size of circles in internal nodes represents bootstrap values in percentages (out of 100). Detailed tree with full genome names is presented in the rectangular form in Additional file 7