UASt regulatory sequences drive expression of the proteolytic domain of Sp7 (starting at amino acid residue V137) containing the mutation C264S and tagged with the Tag:SS(ea) signal sequence. The protein produced is an activated form of Sp7.
Expression of Sp7 under the control of Scer\GAL4da.G32 results in larvae with large melanisation spots and very few of the animals emerge as adults.