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. 2017 Apr 25;7:1157. doi: 10.1038/s41598-017-00786-5

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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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p-distances of mitochondrial and nuclear protein-coding genes between amphioxus and vertebrate taxa. Pairwise p-distances of nucleotide and amino acid sequences of 13 mitochondrial and 952 nuclear genes were calculated for all combinations of four amphioxus and four vertebrate species. The pairwise distances were calculated using MEGA-CC⁷¹ and plotted by mean values for all corresponding species pairs.