This allele from project TCPR0926 was generated at The Centre for Phenogenomics by electroporating Cas9 ribonucleoprotein complexes with single guide RNAs having spacer sequences of GCCAGGTATTACCACCTTCT targeting the 5' side and GGCCTGGCAAGTATCTACCA targeting the 3' side of a critical exon. This resulted in a 907-bp deletion ChrX:136667301 to 136668207. (GRCm38).