1. Signal Transduction Group, Boston Biomedical Research Institute
2. Neurosurgical Service, Massachusetts General Hospital
3. Frontier 21 Project, Life Science Research Center, Asahi Chemical Industry Company, Ltd., Fuji, Shizuoka, Japan
4. Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts
5. Department of Medicine, Harvard Medical School, Boston, Massachusetts