A T-to-A transversion mutation at coding nucleotide 291 in the 1,456-bp cDNA results in a tyrosine (TAT) to a stop codon (TAA) alteration at amino acid 97 (p.Y97*) in the encoded protein. This mutation was absent in the C3H parental strain and all other strains observed. A decreased level of mutant transcript was expressed from this allele. (J:75395)