Hox genes are expressed in structures affected by Hox-gene mutations

An example of Hox-gene expression. (a) The adult wing of D. melanogaster. (b) Ubx protein is not expressed in cells of the developing imaginal disk that will form the forewing. Cells enriched in Hox proteins are stained green; in this image, the green-stained cells are cells that do not form the wing. (c) The adult hind wing (haltere). (d) The Ubx protein is expressed at high levels in all cells of the developing hind-wing imaginal disk.

[Scott Weatherbee.]