This allele was generated at The Jackson Laboratory by electroporating Cas9 protein and 2 guide sequences ATATGCCAAGCGGGCACCTA and AGGGCAACAGCTGTCTGCCA, which resulted in a 1010 bp deletion beginning at Chromosome 11 position 99,978,042 bp and ending after 99,979,051 bp (GRCm38/mm10). This mutation deletes 1010 bp from ENSMUSE00000665201 (exon 1) and is predicted to generate a null allele. (J:188991)