This allele was generated at The Jackson Laboratory by electroporating Cas9 protein and 2 guide sequences AGCGCAGCAATAAAGTTGAG and GTATCAATCTTGATGAGGTA, which resulted in a 560 bp deletion beginning at Chromosome 19 position 40,836,785 bp and ending after 40,837,344 bp (GRCm38/mm10). This mutation deletes ENSMUSE00000386043 (exon 3) and 349 bp of flanking intronic sequence including the splice acceptor and donor and is predicted to cause a change of amino acid sequence after residue 23 and early truncation 21 amino acids later.