1. Division of Industrial Biotechnology, Department of Biology and Biological Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden
2. Wallenberg Wood Science Center, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden
3. Department of Microbiology and Immunology, University of Michigan Medical School, Ann Arbor, Michigan 48109, United States
4. Department of Chemistry, University of Copenhagen, DK-2100 Copenhagen, Denmark