1. Department of Biotechnology; Norwegian University of Science and Technology; Trondheim N-7491 Norway
2. Department of Cancer Research and Molecular Medicine; Norwegian University of Science and Technology; Trondheim N-7491 Norway
3. Department of Biotechnology; SINTEF Materials and Chemistry; Trondheim N-7465 Norway
4. Statoil ASA; Ranheim N-7053 Norway