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. 2017 Sep 6;7:10628. doi: 10.1038/s41598-017-11117-z

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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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The phylogenetic tree of Atp8 gene in molluscs under GTR + I + G substitution model of sequence evolution. Branch lengths are drawn to scale. ML bootstrap values/Bayesian posterior probabilities (>50%) are shown as numbers above the branches. The scale bar means 0.5 substitutions per site. The branch and species names colours identify the marine bivalves clade (blue) and the freshwater bivalves (turquoise). The common ancestor of bivalves and marine bivalves are marked in orange and purple circle, respectively.