A TI{CRIMIC.TG4.0} DNA cassette has been inserted into CG13744 using the CRISPR/Cas9 technique together with a donor plasmid to drive homology directed repair. The cassette is not predicted to trap CG13744 or express GAL4 because the CRISPR sgRNA was mistakenly targeted to a coding exon of the gene; no GAL4 expression was detected in the larval or adult nervous system. The sgRNA sequence used to target the gene was: CGTCCGAGGAACTCCACACTCGG. The homology arms of the donor plasmid used were designed such that there is a small gap between the 3' end of the 5' arm and the 5' end of the 3' arm, thus the insertion of the TI{CRIMIC.TG4.0} cassette is predicted to be accompanied by a deletion of 808bp of genomic sequence flanking the insertion site. The PCR check of the insertion gave a shorter than expected band for the left flank and the expected sized product for the right flank.