A GAL4(DBD)::Zip- hemidriver (component of the 'Split GAL4' system, contains the GAL4 DNA-binding domain) has been inserted at the start codon within exon 2 of dsx. This results in the hemidriver being expressed under the control of endogenous dsx sequences, along with deletion of exon 2.
The VT017258 enhancer fragment followed by the Drosophila synthetic core promoter (DSCP) is fused upstream of the p65(AD)::Zip+ hemidriver (component of a 'split driver' system, contains the p65 activation domain).