FIGURE 3. Distribution of Hox genes in bilaterians.
From the following article:
Hox genes in brachiopods and priapulids and protostome evolution
Renaud de Rosa, Jennifer K. Grenier, Tatiana Andreeva, Charles E. Cook, André Adoutte, Michael Akam, Sean B. Carroll and Guillaume Balavoine
Nature 399, 772-776(24 June 1999)
doi:10.1038/21631
The tree on the left summarizes the 18S rDNA phylogeny of Aguinaldo et al.2. B, common bilaterian ancestor; D, common deuterostome ancestor; E, stem ecdysozoan; L, stem lophotrochozoan; P, common protostome ancestor. Horizontal black lines indicate mapping data (when available). Vertical white bars delineate orthologous genes or groups of genes. Uncertain orthology relationships are indicated by question marks, dashed boxes indicate short PCR fragments, solid boxes indicate complete or almost complete homeoboxes, and striped colours indicate fast-evolving arthropod Hox sequences. The organisms studied in this paper are underlined.
