An enhancer and a suppressor interact with Gl1 in the adult eye. (A-D) Scanning electron micrographs of adult eyes. (A) Wild type. (B) Gl1/+, (C) EG37/+;Gl1/+, both exhibiting a roughened, smaller eye. (D) SG13/+;Gl1/+ showing a slight amelioration of the Gl1 phenotype. Insets are higher magnifications. (E-H) Tangential sections of adult eyes. (E) Wild type showing the regular pattern of ommatidial assembly and the stereotyped trapezoidal pattern of the rhabdomeres of the photoreceptor cells (R1-R7). (F) Gl1/+ eye showing disordered and irregular shaped ommatidia often with aberrant numbers of rhabdomeres. (G) The disorganization is exacerbated in the presence of EG37/+ with the rhabomeres often fused. (H) In the presence of SG13/+ the ommatidia show a more ordered, regular, pattern with each ommatidia often having the correct array of rhabdomeres (compare with E and G).