Fig. 6. vri overexpression induces atrophy of the eye. Scanning electron micrographs of ey-GAL4/UAS-vri1⁹ eye series with progressive reduction of the eye at 25°C (A,E), and extreme phenotype with UAS-vri1¹⁴/+; ey-GAL4/UAS-vri1¹³ at 29°C (F). (A) Rough eye with a moderate reduction in size. (B,C) Ommatidia are disorganized with a globular aspect, bristles are duplicated or missing and regions of apparent irregular growth are observed (B). (D) Very reduced eye. (E) Eye totally absent. (F) At 29°C the UAS-vri1¹⁴/+; ey-GAL4/UAS-vri1¹³ flies lack all head structures derived from eye-antennal disc. The proboscis, which is derived from the labial disc, is present.