This allele was generated at The Jackson Laboratory by electroporating Cas9 protein and 2 guide sequences AGGAAAAGTGAAGTTCCCCG and AGTAGTAGTTATTTCTAGCA, which resulted in a 426 bp deletion beginning at Chromosome 15 position 81,388,213 bp and ending after 81,388,638 bp (GRCm38/mm10). This mutation deletes ENSMUSE00000126258 (exon 4) and 355 bp of flanking intronic sequence including the splice acceptor and donor and is predicted to cause a change of amino acid sequence after residue 80 and early truncation 7 amino acids later.