A TI{CRIMIC.TG4.1} DNA cassette has been inserted into Inx3, in a coding intron, and is predicted to gene trap all annotated transcripts of the gene. The insertion is also within spg; it is in the wrong reading frame to trap spg, but it is difficult to predict whether it might affect its expression. The TI{CRIMIC.TG4.1} 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: AAATATTGACGGTTGGTTCTGGG.