Sequence encoding the GAL4 driver has been inserted into the attP site in TI{TI}Dsec\Or22aRFP, allowing expression of the driver under the control of the endogenous Dsec\Or22a regulatory sequences. The loxP cassette containing the Disc\RFPDsRed(T1).3xP3.cHa marker (present in the TI{TI}Dsec\Or22aRFP chromosome) is still present.