text: Uptake of the radiolabeled model substrates estradiol 17β-glucuronide, estrone 3-sulfate, and << dehydroepiandrosterone sulfate >> (DHEAS) was determined in the absence and presence of compounds 1-6 using Chinese hamster ovary (CHO) cells stably expressing either OATP1B1 or [[ OATP1B3 ]].