1. Y. Ido, K. Chang, J. R. Williamson, Department of Pathology, Washington University School of Medicine, 660 South Euclid Avenue, St. Louis, MO 63110, USA.
2. A. Vindigni and E. Di Cera, Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, 660 South Euclid Avenue, St. Louis, MO 63110, USA.
3. L. Stramm and R. Chance, Endocrine Division, Lilly Research Labs, Lilly Corporate Center, Indianapolis, IN 46285, USA.
4. W. F. Heath and R. D. DiMarchi, Research Technologies and Protein, Lilly Research Labs, Lilly Corporate Center, Indianapolis, IN 46285, USA.