The Hox genes of Drosophila. Eight Hox genes regulate the identity of regions within the adult. The color coding identifies the segments and structures that are affected by mutations in the various Hox genes.
[S. B. Carroll, J. K. Grenier, and S. D. Weatherbee, From DNA to Diversity: Molecular Genetics and the Evolution of Animal Design, 2nd ed. Blackwell, 2005.]