The functional transport by cells transfected with a control vector, OCT1, OCT2, OAT1, NTCP, OATP1B3, OAT3, OATP1B1, or OATP2B1. Data is expressed relative to the control condition (vector). The substrate used for OCT1, OCT2, and the corresponding control was 10 μM metformin. The substrate used for OAT1 and the corresponding control was 2 μM p-aminohippurate (PAH). The substrate used for NTCP and the corresponding control was 2 μM taurocholate (TC). The substrate used for OATP1B3 and the corresponding control was 2 μM bromosulfophthalein (BSP). The substrate used for OAT3, OATP1B1, OATP2B1, and the corresponding control was 2 μM estrone-3-sulfate.