0.17kb deletion that removes the ATG codon and the first 51 amino acids of hbn. The deleted sequence is replaced by a cassette that includes the GAL4 driver (this results in expression of GAL4 under the control of endogenous hbn regulatory sequences). Generated by integration of sequence into the attP site present in TI{TI}hbnKO; a single loxP site and a recombined attP/B site are also present as a result of the mutagenesis.