This allele was generated at The Jackson Laboratory by injecting Cas9 RNA and 4 guide sequences AGTAGGAGGGGGCCATACGG, TTCCTCCTAGTCCCCTGGGG, TTGAATGCAGGCCAAGTTGG and GCCTCCTCTGTCCCAAACGC, which resulted in a 205 bp deletion beginning at Chromosome 8 positive strand position 105,355,428 bp and ending after 105,355,632 bp (GRCm38/mm10). This mutation deletes ENSMUSE00000355153 (exon 4) and 126 bp of flanking intronic sequence including the splice acceptor and donor. In addition there is a 2 bp insertion (AG) at the deletion site that will not alter the results of the exon deletion. This mutation is predicted to cause a change of amino acid sequence after residue 221 and early truncation 14 amino acids later.