The attP cassette in the Mi{MIC}amon^MI00899 insertion has been replaced with a Trojan QF2 cassette that contains a splice acceptor site followed by the T2A peptide, the QF2 variant of Ncra\QF and an Hsp70 transcription termination signal. The insertion is in the correct orientation to gene trap amon. The splice acceptor ensures that the T2A-QF2 open reading frame is incorporated into the amon mRNA, while the T2A sequence is expected to truncate the native amon gene product and promotes the separate translation of the QF2 open reading frame. Thus expression of QF2 is driven by the native amon regulatory sequences.