1. Center for Molecular Recognition, Columbia University, New York, NY 10032.
2. Department of Physiology, College of Physicians and Surgeons, Columbia University, New York, NY 10032.
3. Department of Medicine, College of Physicians and Surgeons, Columbia University, New York, NY 10032.
4. Department of Biochemistry, College of Physicians and Surgeons, Columbia University, New York, NY 10032.
5. Department of Neurology, College of Physicians and Surgeons, Columbia University, New York, NY 10032.