Dhc64C¹⁰² is a dominant suppressor of the Gl¹ phenotype in the eye. More normal facet arrays are seen in the anterior than in the posterior part of the eye in the double heterozygous flies. The optic lobe phenotype of Gl¹ is also suppressed in the double heterozygote, with the strongest defect being that the lamina cell body layer is thicker than normal in the posterior region and the lamina neuropile is somewhat misshapen, particularly anteriorly. The medulla is abnormally rotated, with its posterior edge directly apposed to the lamina, but it is more normally organised than in the Gl¹ single mutant.