1. Department of Molecular Genetics, Smith Kline and French Laboratories, Philadelphia, Pennsylvania 19101.
2. Walter Reed Army Institute of Research, Washington, D.C. 20307.
3. Malaria Branch, Infectious Diseases Program Center, Naval Medical Research Institute, Bethesda, Maryland 20014.
4. Biomedical Research Institute, Rockville, Maryland 20852.
5. Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, Bethesda, Maryland 20205.