ENU mutagenesis induced a T to A transversion at base pair 117,671,449 (v38) on chromosome 5, or base pair 257,680 in the GenBank genomic region NC_000071. The mutation corresponds to residue 2,103 in the mRNA sequence NM_001114545 within exon 7 of 21 total exons. The mutation results in a cysteine (C) to serine (S) substitution at position 426 (C426S).