This allele from project Ap4e1-6638-2877F was generated at The Jackson Laboratory by injecting Cas9 RNA and 3 guide sequences, GCAATCAAGTTGGCCCAACA, TGTCCTGACTGTCGTTTTTA and CTGTTTGTTTACATAGTGAT which resulted in a 1bp insertion A in exon 3 beginning at Chromosome 2 positive strand position 127,014,235 bp (GRCm38). This mutation is predicted to cause amino acid sequence changes after residue 105 and early truncation 19 amino acids later.