1. Department of Immunology and Microbiology The Scripps Research Institute 130 Scripps Way Jupiter FL 33458 USA
2. Chemical Biology Laboratory Center for Cancer Research National Cancer Institute National Institutes of Health Building 376 Boyles Street Frederick MD 21702 USA
3. Department of Medicinal Chemistry Institute of Biomaterials and Bioengineering Tokyo Medical and Dental University 2-3-10 Kandasurugadai, Chiyoda-ku Tokyo 101-0062 Japan
4. Medizinische Klinik und Poliklinik II Universitätsklinikum Würzburg Oberdürrbacherstrasse 6 97080 Würzburg Germany