Expression of gbbScer\UAS.mS1 under the control of Scer\GAL4ap-md544 results in 14% viability, while expression under the control of Scer\GAL4dpp.blk1 results in 97% viability. Expression under the control of either Scer\GAL4hh.PU or Scer\GAL4ci.PU results in 100% lethality. Wings from adult survivors show blistered and ectopic venation phenotypes.