This allele from project TCPR1063 was generated at The Centre for Phenogenomics by electroporating Cas9 ribonucleoprotein complexes with single guide RNAs having spacer sequences of TAAGTGCTAGAAGGATCCTC and CAGGTCTCATGGTACTCATC targeting the 5' side and TTCCAATAACCAGCCCATTC and GCATGGCCAAACATTTACCC targeting the 3' side of a critical exon. This resulted in a 587-bp del Chr6: 48465273 to 48465859 (GRCm38).