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. 2018 Aug 14;19:611. doi: 10.1186/s12864-018-4977-2

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© The Author(s). 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 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.

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Fig. 1 — Definition of branches in the animal tree of life. Rectangles represent the 10 defined branches of appearance for the proteins (B1 to B10). The estimated time of emergence of the branches is indicated under the tree