This allele from IMPC was generated at Medical Research Council Harwell by injecting CAS9 RNA, 4 guide sequences CTTGTCAAAAACAGCAGTCTGGG, CCTTGTCAAAAACAGCAGTCTGG, GAGCATGGCCGAGATTACTCCGG, ATGCTTGGCCGGAGTAATCTCGG, and a non-contributing oligo, which resulted in a Exon Deletion.