However, SNPs associated with X–21796 map to several members of the UGT1A family of genes, which have also been associated with bilirubin levels and risk of gallstones (Stender et al., 2013), and SLCO1B, which is involved in bilirubin transport into the liver (Keppler, 2014). The gene discussed is UGT1A1; the disease is gallstones.