Vectorial transport of the peptide CCK-8 by double-transfected MDCKII cells stably expressing the organic anion transporter OATP1B3 (OATP8) and the export pump ABCC2 - Letschert, K; Komatsu, M; Hummel-Eisenbeiss, J; Keppler, D (J Pharmacol Exp Ther, 2005)