This allele from IMPC was generated at Medical Research Council Harwell by injecting CAS9 Protein and 4 guide sequences CTCCTGTGGAGCTGCAACTATGG, TGTCATGCAGTAGCTCGTTGTGG, CCTGCTGTCTGGGCCGGACCTGC, CCTAAGATATCAGACATCCTGCC, which resulted in a Exon Deletion.