This allele from IMPC was generated at Medical Research Council Harwell by injecting CAS9 RNA and 4 guide sequences CCTTGCGGTGGGGGCTAGCAGGC, GCCTTGCGGTGGGGGCTAGCAGG, CCCACGTTTATGTTCCCGGATCA, CCTTCTAGCCCTTTTACTTCCGG, which resulted in a Exon Deletion.