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. 2017 Nov 10;8:1433. doi: 10.1038/s41467-017-01316-7

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© The Author(s) 2017

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

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Fig. 2 — Molecular phylogenetic analysis of amphibian mitochondrial genomes and genes. The phylogenetic tree is drawn to scale, with branch lengths measured in the number of substitutions per site. The analysis involved a complete mitochondrial (Mt) genome sequences of salamanders, toads and frogs, classified as Rana (blue highlight) or Lithobates (yellow highlight). Analysis of Mt genes b cyb, c rnr1, and d rnr2 of selected frog species. Position of R. catesbeiana indicated by an asterisk