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. 2012 Jul 13;7(7):e40649. doi: 10.1371/journal.pone.0040649

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Zhou et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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The phylogenetic relationship of all the species investigated is in the left. The number of HES/HEY genes is in the right. Two round expansions and a fish specific duplication of HES/HEY are represented by arrows and bars.