A TI{CRIMIC.TG4.1} DNA cassette has been inserted into CG3860, in a coding intron, and is predicted to gene trap all annotated transcripts of the gene. The TI{CRIMIC.TG4.1} cassette was inserted using the CRISPR/Cas9 technique together with a donor plasmid to drive homology directed repair. The sgRNA sequence used to target the gene was: TTATTGACCACTAAACGATAAGG. 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.TG4.1} cassette is predicted to be accompanied by a deletion of 15bp 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.