the fly's suite of Hox genes must be expressed in a precise way and at precise times. Gene switches such as Ubx make the initial decisions of which genes to turn on or off in different body ...

Hox genes and their relatives are involved in several developmental processes in diverse animals, but when did they first arise? The genome sequence of the sponge Amphimedon queenslandica shows ...

Mutations in specific Hox genes caused legs to grow out of a fly's head, wings to grow where they shouldn't be, and a number of other physical deformities.