phiC31-mediated recombination (RMCE) has been used to replace Mi{MIC}GLazMI02243 with a "Trojan" exon containing a splice acceptor (SA), linker, T2A sequence and a GAL4 sequence followed by a poly(A) tail. This results in the production of a truncated GLaz protein (mutant) and Scer\GAL4 under the control of the endogenous Glaz regulatory elements ("GlazT2A-GAL4 gene trap").