Fig. 1. eyg promotes growth of the early eye disc. The eyg¹/eyg^M3-12 mutants have no eye (A), but the phenotype can be rescued by expressing eyg driven by the E2-XS enhancer fragment (B). The eyg^M3-12 homozygotes are headless (C), but the phenotype can be rescued by expressing eyg driven by the E2-XS enhancer fragment (D). (E,F) Clonal expression of eyg (marked by GFP, green) can induce overgrowth (arrows) in the eye disc and antenna disc. Clones posterior to the MF caused only a few extra ommatidia (arrowhead). (E) DIC image.