The FRT cassette has been excised, allowing the αTub84B promoter to drive expression of a full-length yki cDNA that has been mutated to carry a P88L amino acid substitution (blocks nuclear accumulation in response to mTor inhibition) plus three substitutions of phosphorylation sites (S111A, S168A and S250A). In addition, the coding sequence is tagged at the C-terminal end with EGFP.