This allele from IMPC was generated at Medical Research Council Harwell by injecting CAS9 RNA and 4 guide sequences ACTTGAACGCGTCTGGGTCCCGG, CCCGGATCGTAATCGTCGCACAG, AGGTCGCTGCGAGAACCCCCGGG, CCAGGTCGCTGCGAGAACCCCCG, which resulted in a Intra-exdel deletion.