CRISPR/Cas9 genome editing technology was used to generate a 191bp deletion that included exon 8 of the gene. This allele from IMPC was generated at Welcome Trust Sanger Institute by injecting CAS9 RNA and 4 guide sequences CCATGTATGTAGGCAAACTTGGC, TGTTAATGTCTTCTGCTATCAGG, CAACAGGGCAGGTAAGACGAAGG, TAAGAGTATTTCAGTGGACTAGG. (J:237616, J:332580)