A 40bp synthetic oligonucleotide containing four z protein binding sites is fused to the 5' end of w-17.
Deletion of 5' regulatory site at -17bp and the addition of tetramer of z binding site.
5' sequences are deleted up to -17bp and a 40bp synthetic oligonucleotide containing four z protein binding sites is fused to the 5' end.
Construct: w promoter sequences up to 17bp drive w gene expression.