A heat shock promoter drives expression of a mutated form of msl-3, which lacks amino acid residues 34-89, and is tagged at the C-terminal end with EGFP.
Only 8.3% of msl-3083 males carrying msl-3ΔCBD.hs.T:Avic\GFP-EGFP survive to adulthood. The surviving males show a range of abnormalities, including rough eyes, missing bristles and misshapen wings.