Genomic sequence encoding the Dvir\wit locus has been inserted into the attP site in TI{TI}witattP. Sequence encoding a loxP site, a wGMR.PHb marker, a loxP site, the Disc\RFPDsRed.3xP3.cUa marker and a loxP site is present downstream of the inserted Dvir\wit transcription unit.