(A) Electroretinogram traces of control flies (CTL), mutant flies (3L61, 3L62), and mutant flies carrying a genomic rescue fragment (Rescue). The ERG profiles of the mutant flies show diminished “on and off” transients but normal depolarization in response to light. (B) TEM of cartridges from a control, 3L61, 3L62, and a rescued fly. The photoreceptor terminals are marked in blue. (C) Distribution of photoreceptor terminals per-cartridge for wild-type (n=31 cartridges from 3 animals), mutant (3L61: n=52 from 3 animals; 3L62: n=32 from 3 animals) and rescued flies (n=43 cartridges from 3 animals). (D) The R7 and R8 projection patterns (24B10 staining) of a control animal, a 3L61 mutant, a 3L62 mutant, a CadNΔ14 mutant, a Liprin αe mutant, and a 3L61 rescued fly. The arrows indicate the mistargeted terminals. The genotypes of flies used in this figure: control flies (y w eyFLP GMR-lacZ; FRT80B iso/FRT80B cl, ubiGFP); 3L61 (y w eyFLP GMRLacZ; FRT80B 3L61/FRT80B cl, ubiGFP); 3L62 (y w eyFLP GMRLacZ; FRT80B 3L61 or 3L62/FRT80B cl, ubiGFP); rescued flies: (y w; rich-gRE::VK37/CyO; FRT80B 3L61); CadN (y w eyFLP GMRlacZ; FRT40A CadNΔ14/FRT40A ubiGFP) and Liprin α (y w eyFLP GMRlacZ; FRT40A Liprin αe/FRT40A cl). (See also Figure S1)