P{w+m*=GFP-un1}CyO is an unidentified insertion on CyO expressing GFP and carrying a mini-white selectable marker. The inserted construct may contain additional genomic sequences or selectable marker(s). Multiple insertions may be present, and P{GFP-un1}CyO might represent two insertions of different constructs, e.g. a GAL4 driver and a UAS-GFP responder.