This allele from IMPC was generated at Medical Research Council Harwell by injecting CAS9 RNA and 4 guide sequences GGTATGAAACTACCACCCCGTGG, CCACCATACCCTTGATCTCACAT, TTTTGAGTGCTAATCCTACGTGG, TTTGAGTGCTAATCCTACGTGGG, which resulted in a Exon Deletion.