Fig. 3. elav and svp-lacZ expression in larval eye discs expressing RD proteins. Discs were stained for Elav (red) and ß-gal (green). The ommatidia in the posterior of the GMR-Gal4 UAS-AML1 eye disc (arrow in G) are more disorganized and degenerated than in GMR-Gal4 UAS-AML1-ETO discs (E). In the higher magnification photographs (B,D,F,H), a single ommatidium is circled. The eye discs were taken from larvae of the following genotypes: (A,B) wild type, four cells express svp-lacZ per ommatidium; (C,D) lz^null, more than four cells express svp-lacZ per ommatidium; (E,F) GMR-Gal4 UAS-AML1-ETO, the majority of ommatidia have only two svp-lacZ-expressing cells; (G,H) GMR-Gal4 UAS-AML1, many ommatidia have four cells that express svp-lacZ.