1. Department of Infectious Diseases
2. Department of Hematology, Kumamoto University School of Medicine, Kumamoto 860-8556, Japan
3. Experimental Retrovirology Section, HIV and AIDS Malignancy Branch, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892
4. Departments of Chemistry and Medicinal Chemistry, Purdue University, West Lafayette, Indiana 47907
5. Department of Biology, Georgia State University, Atlanta, Georgia 30303
6. Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary