1. a Peptide Technologies Corporation , Box 368 Main Trinity College, Washington , D.C. , 20017
2. b Laboratory of Technical Development , National Heart, Lung, and Blood Institute Disorders and Stroke National Institutes of Health , Bethesda , Maryland , 20892
3. c Experimental Therapeutics Branch National Institute of Neurological and Communicative Disorders and Stroke National Institutes of Health , Bethesda , Maryland , 20892