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Regioselectivity of human UDP-glucuronosyltransferases (UGTs) for parent estrogens estrone (E1) and estradiol (E2), their catechol estrogens metabolites 2-hydroxy (OH)E1/E2 and 4-OHE1/E2, and their methoxy metabolites 2-methoxy (MeO)E1/E2 and 4-MeOE1/E2. Red is used for E2 and its metabolites, whereas blue refers to E1 and its metabolites.
