This allele from project TCPR1456 was generated at The Centre for Phenogenomics by electroporating Cas9 ribonucleoprotein complexes with single guide RNAs having spacer sequences of TTAGGCCCAGATGTTGTAAT targeting the 5' side and CAGTGTGTCACGGCCTGCTG targeting the 3' side of a critical region. This resulted in a 373-bp del Chr7:140029784 to 140030156 (GRCm38).