UAS sequences drive expression of full length toy in which the toy paired domain has been replaced by the ey paired domain.
eye | ectopic, with Scer\GAL4dpp.blk1
leg, with Scer\GAL4dpp.blk1
ey::toytoyPD-EYBB.Scer\UAS; Scer\GAL4dpp.blk1 adults often have ectopic eyes on their legs, but never on their antennae.