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. 2014 Oct 14;14:266. doi: 10.1186/s12870-014-0266-7

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© Zhao et al.; licensee BioMed Central Ltd. 2014

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. 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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AHL genes identified in land plant species. (a) The numbers of the AHL genes identified in each sequenced plant genome were listed accordingly. The percentages of each type were also listed in parenthesis. (b) AHL genes emerged in land plant species and further diverged into two separate monophyletic clades (Clade-A and Clade-B). The red star denoted the time point when the AHL genes are likely to have emerged.