1. Chiron Corporation, Emeryville, California 94608-29161;
2. University of Massachusetts Medical Center, Worcester, Massachusetts 016552;
3. Aaron Diamond AIDS Research Center, The Rockfeller University, New York, New York 100163;
4. Tulane Regional Primate Research Center, Covington, Louisiana 704334;
5. Panacos Pharmaceuticals, Gaithersburg, Maryland 208775; and
6. Walter Reed Army Institute of Research, Rockville, Maryland 208506