UDP-glucuronosyltransferase 1-1, also known as UGT-1A, is an enzyme that in humans is encoded by the UGT1A1 gene.
UGT-1A is a uridine diphosphate glucuronosyltransferase, an enzyme of the glucuronidation pathway that transforms small lipophilic molecules, such as steroids, bilirubin, hormones, and drugs, into water-soluble, excretable metabolites. From Wikipedia