This allele was generated at The Jackson Laboratory by electroporating Cas9 protein and 2 guide sequences TGCCTGGACCAACCGCCAGA and ATCAGGATTCAGGATTCCCC, which resulted in a 389 bp deletion beginning at Chromosome 17 position 56,010,881 bp and ending after 56,011,269 bp (GRCm38/mm10). This mutation deletes ENSMUSE00001271227 (exon 4) and 265 bp of flanking intronic sequence including the splice acceptor and donor and is predicted to cause a change of amino acid sequence after residue 167 and early truncation 33 amino acids later.