1. Department of Hematology
2. Department of Infectious Diseases, Kumamoto University School of Medicine, Kumamoto 860-8556
3. Minase Research Institute, Ono Pharmaceutical Co. Ltd., Osaka 618-8585
4. Moravek Biochemicals, Inc., Brea, California 92821
5. Department of Virology, Tohoku University Graduate School of Medicine, Sendai 980-8575, Japan
6. Experimental Retrovirology Section, HIV and AIDS Malignancy Branch, National Cancer Institute, Bethesda, Maryland 20892