- Cyclosporin a and enterohepatic circulation of bile salts in rats: decreased cholate synthesis but increased intestinal reabsorption. Hulzebos, C.V., Wolters, H., Plösch, T., Kramer, W., Stengelin, S., Stellaard, F., Sauer, P.J., Verkade, H.J., Kuipers, F. J. Pharmacol. Exp. Ther. (2003)