A duplicated sev enhancer and Hsp70 promoter drive expression of a mutated dos cDNA in which the predicted sl protein binding sites have been mutated (amino acid replacements Y358F and Y537F).
wild-type
dosY358F.Y537F.hs.2sev rescues dosP115
dosY358F.Y537F.hs.2sev rescues dosR31
A single copy of dosY358F.Y537F.hs rescues the lethality of homozygous dosR31 or dosP115.