Screenshot of the ABCB1 Variants page from the PharmGKB Web site (retrieved May 30, 2008, from http://www.pharmgkb.org/do/serve?ojbCls=Gene&objId=PA267&tabType=12). The rectangular box in the upper portion of the figure shows the genomic region containing the ABCB1 gene, with single-nucleotide polymorphism (SNP) locations represented as tick marks. The lower section of the figure is a table displaying ABCB1 variants, for which genotyping information has been submitted to PharmGKB. For each variant, the Golden Path position provides unambiguous polymorphism positioning information. The dbSNP rsID, the nucleotide(s) observed at the polymorphic position, the genetic feature in which the polymorphism occurs, and amino-acid translations of codons containing polymorphic nucleotides are listed. Additionally, two- and three-star designations reflect that the variant has been curated to supply brief (two-star) or detailed (three-star) descriptions of phenotype(s) observed for that variant. (Note: To include more curated variants in this image, some noncurated variants are not shown, as indicated by the white area between the second and third variants listed.).