1. Department of Chemistry, Bioscience and Environmental Technology-Centre for Organelle Research, Faculty of Science and Technology, University of Stavanger, P.O. Box 8600 Forus, N-4021 Stavanger, Norway
2. Department of Microbiology, Oslo University Hospital, Rikshospitalet, NO-0372 Oslo, Norway
3. Department of Biochemistry and Molecular Biology, University of Southern Denmark, 5230 Odense M, Denmark
4. Department of Molecular Medicine, Institute of Basic Medical Sciences, University of Oslo, NO-0317 Oslo, Norway