Construct: ac regulatory region carrying 4 tandem copies of the E-1 h binding sites, each mutated a single base pair.
Df(1)sc10-1, ac2.2.hE1mut.tvDa has wing vein L5 phenotype
Df(1)sc10-1, ac2.2.hE1mut.tvDa has mesothoracic pleurum phenotype
Ectopic bristles form on wing vein L5 and also on the pleura in an ac- sc- background.