The RMCE cassette of the Mi{MIC}Fmr1MI09043 insertion has been replaced with a Trojan-Gal4 cassette. The insertion is in the coding intron of 8 annotated transcript isoforms of the Fmr1 gene (predicted to gene trap the gene) and in an intron in the 5' UTR of 3 annotated transcripts of Fmr1.