ENU-induced A to G transition at base pair 82,223,154 (v38) on chromosome 15, or base pair 1,227 in the GenBank genomic region NC_000081. The mutation corresponds to residue 540 in the mRNA sequence NM_028075 within exon 3 of 3 total exons. The mutation results in a threonine to alanine substitution at residue 158 (T158A) in the BAFF-R protein. (J:265247)