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. 2017 Jan 5;18:19. doi: 10.1186/s12864-016-3407-6

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© The Author(s). 2017

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. 4 — Tree building artifacts, when constructing bifurcating trees with ancestral nodes. This figure shows the three possible resolutions of an ancestral node in a bifurcating tree, which only allows leaves in the tree