1. Department of Biomedicine
2. Department of Medical Biochemistry and Microbiology, Uppsala University, BMC, Box 582, Uppsala SE-751 23, Sweden
3. Department of Oral Sciences-Periodontics, University of Bergen, Jonas Lies vei 91, N-5009 Bergen, Norway
4. Academic Center for Dentistry, Amsterdam,The Netherlands
5. Department of Dermatology, University of Cologne, Cologne, Germany
6. Max Planck Institute for Biochemistry, Martinsried, Germany
7. Department of Prosthodontics, Georg-August-Universität, Göttingen, Germany
8. Amersham Biosciences AB, Uppsala, Sweden