ENU mutagenesis induced a C to T transition at base pair 80,844,868 (v38) on chromosome 4, or base pair 10,661 in the GenBank genomic region NC_000070. The mutation corresponds to residue 1,280 in the mRNA sequence NM_031202 within exon 5 of 8 total exons. The mutated nucleotide is indicated in results in the conversion of glutamine 331 to a stop codon (Q331*).