ENU-induced A to T transversion at base pair 59,474,550 (v38) on chromosome 13, or base pair 82,817 in the GenBank genomic region NC_000079 encoding Agtpbp1. The mutation corresponds to residue 3,019 in the NM_023328 mRNA sequence in exon 21 of 26 total exons. The mutation results in an aspartic acid to valine substitution at position 954 (D954V) in the Nna1 protein.