1. Department of Refractory Viral Infections, National Center for Global Health and Medicine Research Institute, Tokyo, Japan
2. Experimental Retrovirology Section, HIV and AIDS Malignancy Branch, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, USA
3. Department of Chemistry, Purdue University, West Lafayette, Indiana, USA
4. Department of Medicinal Chemistry, Purdue University, West Lafayette, Indiana, USA
5. Protein Crystal Analysis Division, Japan Synchrotron Radiation Research Institute, Hyogo, Japan
6. Department of Clinical Sciences, Kumamoto University Hospital, Kumamoto, Japan