1. Federal University of Bahia School of Medicine, Bahia, Brazil.
2. Seattle Biomedical Research Institute, Seattle, WA 98109.
3. Celtrix Laboratories Inc., Palo Alto, CA 94303.
4. Bristol-Myers Squibb Pharmaceutical Research Institute, Seattle, WA 98121.
5. Comell University Medical College, New York, NY 10021.