M. DONOWITZ,1 C. DE LA HORRA,2 M. L. CALONGE,2 I. S. WOOD,2 J. DYER,2 S. M. GRIBBLE,2 F. SANCHEZ DE MEDINA,1 C. M. TSE,1 S. P. SHIRAZI-BEECHEY,3 AND A. A. ILUNDAIN2 1Departments of Medicine and Physiology, GI Division, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205-2195; 2Departments of Animal Physiology and Biology, School of Pharmacy, University of Seville, E-41009 Sev...