5,289bp SalI-XhoI genomic fragment containing the Sxl-Pe start site as well as 3,651bp upstream and 1,629bp downstream are fused just upstream of lacZ.
Sxl embryonic promoter is fused to an Adh ::lacZ fusion gene.
An increased sisA and sc dose equivalent to that in females cannot activate the construct P{SxlPe-lacZ} to the female expression level in all tissues.