UASt regulatory sequences drive expression of an inverted repeat.
lethal, with Scer\GAL4Act5C.PU
interommatidial bristle, with Scer\GAL4GMR.PU
ommatidium, with Scer\GAL4GMR.PU
Scer\GAL4GMR.PU-mediated expression results in several events of ommatidial fusion and bristles are very often missing or dislodged from their sockets.