, an allele of , causes tissue overgrowth in the eye.

Mutant , generated via EMS mutagenesis in , was studied by undergraduate students participating in the Fly-CURE. After inducing genetically mosaic tissue in the adult eye, mutant tissue displays a robust increase in cell division and a rough appearance. Complementation mapping and sequence analysis identified a nonsense mutation in the gene , which we named ( ) due to observed increases in red-pigmented mutant tissue compared to controls.