1. Biology Department, Indiana University-Purdue University at Indianapolis, Indianapolis, Indiana 46202;
2. Diabetes Branch, Division of Intramural Research, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland 20892; and
3. Dipartimento di Medicina Sperimentale e Clinica “G. Salvatore,” Universita di Catanzaro, Catanzaro, 88100 Italy