1. Cytel Corp., La Jolla, CA 92037.
2. Department of Immunology, Research Institute of Scripps Clinic, La Jolla, CA 92037.
3. Biomembrane Institute, Seattle, WA 98119.
4. Department of Pathobiology and Microbiology, University of Washington, Seattle, WA 98195.
5. Departments of Chemistry and Molecular Biology at the Research Institute of Scripps Clinic, La Jolla, CA 92037.