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Expression patterns in groups of wing (left) and haltere (right) imaginal discs of several genes known to play a role in patterning the developing Drosophila wing. The Hox gene Ultrabithorax (Ubx) regulates a subset of these genes in the developing haltere. Mutations in the Ubx locus result in halteres being transformed to a second pair of wings (inset). (For details, see Weatherbee et al., p. 1474.)