ENU-induced T to A transversion at base pair 71,858,929 (v38) on chromosome 9, or base pair 252,891 in the GenBank genomic region NC_000075. The mutation corresponds to residue 1,759 in the mRNA sequence NM_011544 within exon 17 of 21 total exons. The mutation results in a valine to aspartic acid substitution at residue 498 (V498D) in the HEB protein.