Figure 1

The C. elegans and Drosophila Hox clusters. The orthologs are indicated by the same coloring. Arrows point to body domains where Hox genes exert their action. Dotted red arrows indicate body parts in which ceh-13 is expressed. The blue double arrow indicates the inversion event that occurred between the ancestors of ceh-13 and lin-39. Color meanings: red and orange, anterior paralogs; yellow and green, middle paralogs; dark blue, posterior paralogs.