A TI{CRIMIC.TG4.0} DNA cassette has been inserted into Fatp3, in a coding intron, and is predicted to gene trap all annotated transcripts of the gene. The TI{CRIMIC.TG4.0} cassette was inserted via the CRISPR/Cas-9 drop-in technique, using a dsDNA donor vector with homology arms of length 200bp. The sgRNA sequence used to target the gene was: CCCATGTCGCTCTTAGTCACTGG. The PCR check of the insertion gave a longer than expected band for the left flank and the expected sized product for the right flank.