text: In complementary RNA (cRNA)-injected Xenopus laevis oocytes, << rifamycin SV >> (10 micromol/L) cis-inhibited human organic anion transporting polypeptide C (SLC21A6) (OATP-C), human organic anion transporting polypeptide 8 (SLC21A8) (OATP8), human organic anion transporting polypeptide B (SLC21A9) (OATP-B), and human organic anion transporting polypeptide A ([[ SLC21A3 ]]) (OATP-A) mediated BSP uptake by 69%, 79%, 89%, and 57%, respectively, as compared with uptake into control oocytes.