UAS regulatory sequences drive expression of a chimeric protein comprised of the scw prodomain fused to the gbb ligand domain. The gbb ligand domain has been mutated (carries the amino acid replacement T358N) to introduce a second N-glycosylation motif in the fusion protein (this additional motif is in the corresponding position to the scw-specific N-glycosylation motif found in scw). The open reading frame is tagged with Tag:FLAG.