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.