This allele was generated at The Jackson Laboratory by injecting Cas9 RNA and 4 guide sequences GCCAACTTAGAACATGTATT, CATGTATTGGGCTATCATGG, ATAGCTATCAAGTTCAGGTG and GCCCTAGTCATTGCTACAAA, which resulted in a 366 bp deletion beginning at Chromosome 3 position 72,960,985 bp and ending after 72,961,350 bp (GRCm38/mm10). This mutation deletes ENSMUSE00000496008 (exon 4) and 248 bp of flanking intronic sequence including the splice acceptor and donor and is predicted to cause a change of amino acid sequence after residue 75 and early truncation 5 amino acids later.