This allele from IMPC was generated at Medical Research Council Harwell by injecting CAS9 RNA and 4 guide sequences CTGGTTAATCTACTGAGGTCAGG, CCAGGTGTCAATAATTGAGCGGG, GAGGTACTAGCACCAGTCATGGG, CGTCCTGTCCGAATCCCTACAGG, which resulted in a Exon Deletion.