Cell Polarity/physiology; Drosophila Proteins/physiology; Signal Transduction/physiology; Adaptor Proteins, Signal Transducing; Animals; Binding Sites/genetics; Binding, Competitive; Carrier Proteins/genetics; Carrier Proteins/metabolism; Carrier Proteins/physiology; Cell Polarity/genetics; DNA-Binding Proteins/genetics; DNA-Binding Proteins/metabolism; DNA-Binding Proteins/physiology; Dishevelled Proteins; Drosophila Proteins/genetics; Drosophila Proteins/metabolism; Drosophila melanogaster/embryology; Drosophila melanogaster/genetics; Drosophila melanogaster/physiology; Eye/cytology; Eye/embryology; Eye/metabolism; Eye Proteins/genetics; Eye Proteins/metabolism; Frizzled Receptors; Gene Expression Regulation, Developmental; Immunoprecipitation; LIM Domain Proteins; Membrane Proteins/genetics; Membrane Proteins/metabolism; Membrane Proteins/physiology; Models, Biological; Mutation; Phenotype; Phosphoproteins/genetics; Phosphoproteins/metabolism; Phosphoproteins/physiology; Phosphorylation; Photoreceptor Cells, Invertebrate/cytology; Photoreceptor Cells, Invertebrate/embryology; Photoreceptor Cells, Invertebrate/metabolism; Protein Binding; Receptor Protein-Tyrosine Kinases/genetics; Receptor Protein-Tyrosine Kinases/metabolism; Receptors, G-Protein-Coupled; Signal Transduction/genetics; Two-Hybrid System Techniques; Wings, Animal/cytology; Wings, Animal/embryology; Wings, Animal/metabolism