This allele from project TCPR0927 was generated at The Centre for Phenogenomics by electroporating Cas9 ribonucleoprotein complexes with single guide RNAs having spacer sequences of GTTGCTATGGTAAGCAGACA and TTCAAGGGATAGCAATCAGC targeting the 5' side and ATGGATAAATGTATCAGGGT and TGAATTCGGCTTATATTCTT targeting the 3' side of a critical region. This resulted in a 2,043-bp deletion Chr3:41725596 to 41727638 (GRCm38).