1. H. Ishii, D. Koya, C. Takagi, P. Xia, A. Clermont, S.-E. Bursell, E. P. Feener, G. L. King, Research Division, Joslin Diabetes Center, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, 1 Joslin Place, Boston, MA 02215, USA.
2. M. R. Jirousek, W. F. Heath, L. E. Stramm, Lilly Laboratories, Indianapolis, IN 46285, USA.
3. T. S. Kern, Department of Ophthalmology, University of Wisconsin, Madison, WI 53706, USA.
4. L. M. Ballas, Sphinx Pharmaceutical, Durham, NC 27707, USA.