Fig. 5. Co-expression of dpp and eya rescues photoreceptor differentiation and furrow progression in smo mutant clones. (A-H) Each set of three panels in A-H depicts the same disc containing large smo clones stained for anti ß-galactosidase (red), Anti-Elav (green) or a merge of the two. The ey-GAL4 driver was used to induce transgene expression in all cases. (A-D) Neither dpp (A,C) nor eya (B,D) expression alone can rescue the loss of photoreceptor differentiation in posterior margin smo clones (A,C) or the slowing of furrow progression in internal smo clones (arrows in B,D). (E,F) Posterior margin smo clones expressing both dpp and eya differentiate photoreceptors as visualized by Elav immunoreactivity (arrow in E). Furrow progression is not delayed in internal smo clones expressing dpp and eya (arrow in F). (G,H) Similarly, co-expression of dpp, eya and so also rescues photoreceptor differentiation and furrow progression in smo clones, often inducing ectopic furrows from anterior smo clonal areas (arrows in G,H).