A heat shock promoter drives expression of a mutated form of msl-3, which lacks amino acid residues 88-153, and is tagged at the C-terminal end with EGFP.
msl-3ΔPOLAR.hs.EGFP partially rescues msl-3083
71.48% of msl-3083 males carrying msl-3ΔPOLAR.hs.T:Avic\GFP-EGFP survive to adulthood.