1. University of Alabama at Birmingham, Center for Macromolecular Crystallography, Birmingham, AL 35294.
2. George Marshall Space Flight Center, Huntsville, AL 35812.
3. E. I. du Pont de Nemours & Company, Central Research and Development Department, Wilmington, DE 19880.
4. Upjohn Company, Kalamazoo, MI 49001.
5. Merck Sharp & Dohme Research Laboratories, Rahway, NJ 07065.
6. Schering-Plough Corporation, Bloomfield, NJ 07003.
7. Astronomy Department, University of Washington, Seattle, WA 98195.
8. University of California at Riverside, Riverside, CA 92521.
9. Laboratory of Molecular Biophysics, University of Oxford, Oxford OX1 3QU, United Kingdom.
10. Wellcome Research Laboratories, Beckenham BR3 3BS, United Kingdom.