ENU-induced T to A transversion at base pair 11,000,855 (v38) on chromosome 15, or base pair 135 in the GenBank genomic region NC_000081 encoding Slc45a2. The mutation corresponds to residue 135 in the mRNA sequence NM_053077 within exon 1 of 7 total exons. The mutation results in substitution of tyrosine 13 for a premature stop codon (Y13*) in the SLC45A2 protein.