1. Department of Biology, University of Utah, Salt Lake City 84112.
2. Clayton Foundation Laboratories for Peptide Biology, Salk Institute, La Jolla, CA 92057.
3. Department of Neurological Surgery, University of Southern California School of Medicine, Los Angeles, CA 90033.
4. The Marine Science Institute, University of the Philippines, Diliman, Quezon City 1101, Philippines.
5. Pfizer Central Research, Groton, CT 06340.
6. Department of Pathology, University of Utah, Salt Lake City 84112.