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. 2006 Jul 24;7(7):R64. doi: 10.1186/gb-2006-7-7-r64

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Copyright © 2006 Ryan et al.; licensee BioMed Central Ltd.

This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Hypothetical scenarios for the evolution and diversification of homeodomain classes relative to the cnidarian-bilaterian divergence. The timing of the cnidarian-bilaterian divergence is indicated by an arrow and a dashed vertical line. Cnidarian homeobox genes are indicated by red lines. Protostome (for example, Drosophila) homeobox genes are indicated by green lines. Deuterostome (for example, human) homeobox genes are indicated by blue lines. (a) Cnidaria diverges from Bilateria prior to origin of the major homeodomain classes (ANTP, PRD, LIM, POU, SINE, TALE). (b) Cnidaria diverges from Bilateria after the origin of homeodomain classes but before their diversification. (c) Cnidaria diverges from Bilateria after the diversification of homeobox classes. (d) At the time of the cnidarian-bilaterian divergence, some homeobox classes have not yet originated (ANTP, PRD) whereas others have diversified extensively (POU, SINE).