This allele from project TCPR1524 was generated at The Centre for Phenogenomics by electroporating Cas9 ribonucleoprotein complexes with single guide RNAs having spacer sequences of CTCTCAAAGGTTCTCCTGCG targeting the 5' side and TTATTATACCATAGTACAGT targeting the 3' side of a critical region. This resulted in a 522-bp deletion Chr14:7629190-57629711 (GRCm38).