1. Department of Experimental Medicine, Venezuelan Institute of Scientific Investigation, Caracas, Venezuela, and the Departments of Medicine and Botany, University of Washington, Seattle, Wash.
2. Department of Experimental Medicine, Venezuelan Institute of Scientific Investigations, and Professor of Medicine, Central University of Venezuela, Caracas, Venezuela.
3. Department of Experimental Medicine, Venezuelan Institute of Scientific Investigations, Caracas, Venezuela.
4. Division of Hematology Department of Medicine, University of Washington, Seattle, Wash. 98105.
5. Department of Botany, University of Washington, Seattle, Wash. 98105; Recipient of Training Grant AM 05130.
6. Division of Hematology, and Professor, Department of Medicine, University of Washington, Seattle, Wash.