This allele from project TCPR1568 was generated at The Centre for Phenogenomics by electroporating Cas9 ribonucleoprotein complexes with single guide RNAs having spacer sequences of ATGGCGATCACTAATTTACC targeting the 5' side and AAAGTTTTATTGGCCTTTAC targeting the 3' side of a critical region. This resulted in a1019-bp del, Chr4:11245303-11246321 (GRCm38).