Figure 3.—

Delta modulates sens function in the absence of proneural genes. The sc^10-1 deficiency removes the ac/sc locus, and hemizygous males lack IOBs (A and E). Loss of one copy of Dl does not affect this phenotype (B and F). In the sc^10-1 background, ectopic Sens leads to the formation of IOBs and a roughening of the eye surface (C and G). Removal of one copy of Dl increases the number of bristles that are formed and leads to a further loss of normal ommatidial surface architecture (D and H). Images in A–D are shown at 200× magnification, and images in E–H are shown at 1000×. Bars, 50 μm.