A TI{CRIMIC.TG4.0} DNA cassette has been inserted into CtsL1, in a coding intron, and is predicted to gene trap 3 of the 4 annotated transcripts of the gene (it is not predicted to trap CtsL1-RD). 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: AGAGACCTCCTCTCCCAGCTCGG.