The attP cassette in the TI{T-GEM.0}EHRGAL4 insertion has been replaced with a Trojan GAL4DBD cassette that contains a splice acceptor site followed by the T2A peptide, the GAL4(DBD)::Zip- component of the SplitGAL4 system and an Hsp70 transcription termination signal. The insertion is in the correct orientation to gene trap EHR. The splice acceptor ensures that the T2A-GAL4DBD open reading frame is incorporated into the EHR mRNA, while the T2A sequence is expected to truncate the native EHR gene product and promotes the separate translation of the GAL4DBD open reading frame. Thus expression of the GAL4(DBD)::Zip- component of the SplitGAL4 system is driven by the native EHR regulatory sequences.