The attP cassette in the TI{T-GEM.0}EHRGAL4 insertion has been replaced with a Trojan p65AD cassette that contains a splice acceptor site followed by the T2A peptide, the p65(AD)::Zip+ component of the SplitGAL4 system ("p65AD") and an Hsp70 transcription termination signal. The insertion is in the correct orientation to gene trap EHR. The splice acceptor ensures that the T2A-p65AD 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 p65AD open reading frame. Thus expression of the p65(AD)::Zip+ component of the SplitGAL4 system is driven by the native EHR regulatory sequences.