ENU-induced C to T transition at base pair 95,545,384 (v38) on chromosome 3, or base pair 18,599 in the GenBank genomic region NC_000069 encoding Ctss. The mutation corresponds to residue 592 in the mRNA sequence NM_001267695 within exon 5 of 8 total exons and to residue 589 in the mRNA sequence NM_021281 within exon 5 of 8 total exons. The mutated nucleotide is indicated in red. The mutation results in substitution of glutamine 160 to a premature stop codon (Q160*) in variant 1 and Q159* in variant 2 of the CTSS protein.