Figure 3.

Induction of ectopic antennae, wings, and legs in different genetic contexts. (a) Induction of an ectopic antenna (arrowhead) on the side of the head in UAS-N^act ey-GAL4 ey² mutant fly. 1, 2, and 3: first, second, and third antennal segments, respectively. Arrow indicates normal antenna. (b) Induction of ectopic wing structures (arrowhead) in the eye region (arrow) by activation of Notch signaling and the simultaneous ectopic expression of Antennapedia (Antp). Wing blade and triple row of wing marginal bristles are induced in a UAS-N^act UAS-Antp ey-GAL4 fly replacing parts of the original eye. (c) Partial transformation of the ectopic antenna (arrowhead) into leg structures with a claw (c). Arrow indicates original antenna.