A single T nucleotide insertion is located at position 945 in exon 6 (945T) creating a frameshift mutation resulting in a truncated protein due to a premature stop codon at the end of exon 6 at position 309 (K309*). This mutation is unique to BALB/cCrl and BALB/cAnNCrl strains and is not found in BALB/cJ derived strains. (J:177709)