This allele was generated at The Jackson Laboratory by injecting Cas9 RNA and 4 guide sequences TGCGGGGCGCTGCTGACTGC, CTGCGGGGCGCTGCTGACTG, AATCCTCTAATAGAAGAACT and CAATCCTCTAATAGAAGAAC, which resulted in a 658 bp deletion beginning at Chromosome 7 positive strand position 28267973 bp GTCAGCAGCGCCCCGCAGAC, and ending after GATCAATCCTCTAATAGAAG at 28268630 bp (GRCm38/mm10). This mutation creates an internal deletion of 658 bp from ENSMUSE00000339928 (exon 1) and is predicted to cause a change of amino acid sequence after residue 6 and early truncation 74 amino acids later. (J:188991)