FIG. 1.

SULT1A1 locus. SULT1A1 is highly polymorphic with both a copy number variation and multiple single nucleotide polymorphisms. Copy number variation is demonstrated by each blue box representing a copy of the SULT1A1 gene located on a chromosome (not to scale). Below, the location of the SNPs (arrows) are shown on a diagram of the gene, with coding exons depicted by the blue boxes, noncoding exons depicted by orange boxes, and introns and flanking regions shown as a line.