This allele from project TCPR1555 was generated at The Centre for Phenogenomics by electroporating Cas9 ribonucleoprotein complexes with single guide RNAs having spacer sequences of CTTGGTTAGCTAATCTACCT targeting the 5' side and GTTAACGTAAACCAGCTATC targeting the 3' side of a critical region. This resulted in a 520-bp deletion, Chr9:106715931-106716450 (GRCm38).