This allele from IMPC was generated at Medical Research Council Harwell by injecting CAS9 Protein and 4 guide sequences ACTTTCATGTGGGGTCGGTTAGG, CAATTCACCCTGGCAAAGTCAGG, CCAGTGACTTTCATGTGGGGTCG, CCTAGGGACCCAATTCACCCTGG, which resulted in a Exon Deletion.