Scer\GAL4GMR.PU-mediated expression results in a normal eye.
Scer\GAL4ey.PU-mediated expression results in a rough eye with irregular alignment of ommatidia and bristles. Ommatidia are of irregular sizes with excess/fewer rhabdomeres than normal; however, each ommatidium contains normally polarized photoreceptor cells, suggesting that the phenotypes are caused by defects in photoreceptor clustering during ommatidial formation.