- Organic anion transporting polypeptide 1B1 activity classified by SLCO1B1 genotype influences atrasentan pharmacokinetics. Katz, D.A., Carr, R., Grimm, D.R., Xiong, H., Holley-Shanks, R., Mueller, T., Leake, B., Wang, Q., Han, L., Wang, P.G., Edeki, T., Sahelijo, L., Doan, T., Allen, A., Spear, B.B., Kim, R.B. Clin. Pharmacol. Ther. (2006)