1. Department
of Medical Biochemistry
and Microbiology, Uppsala University, BMC
Box 582, SE-75123 Uppsala, Sweden
2. Department of Medicinal Chemistry, University of Copenhagen, Universitetsparken 2, DK-2100
Copenhagen, Denmark
3. Division
of Molecular Biotechnology,
Department of Physics, Chemistry and Biology, Linköping University, SE-58183 Linköping, Sweden
4. Istituto Pasteur-Fondazione
Cenci Bolognetti and Istituto di Biologia e Patologia Molecolari del
CNR, Dipartimento di Scienze Biochimiche “A. Rossi Fanelli”, Sapienza Università di Roma, Piazzale A. Moro
5, 00185 Rome, Italy