This allele from project TCPR1440 was generated at The Centre for Phenogenomics by electroporating Cas9 ribonucleoprotein complexes with single guide RNAs having spacer sequences of CCCACGAAGTCACCTTATTC targeting the 5' side and CTGAAGACGTTTTCCGCGAT targeting the 3' side of a critical region. This resulted in a 340-bp del Chr19: 11977736-11978075 (GRCm38).