1. Pharmaceutical Microbiology Section, Institute for Medical Microbiology, Immunology, and Parasitology, University of Bonn, D-53115 Bonn, Germany.
2. Statens Serum Institut, 2300 Copenhagen S, Denmark.
3. Department of Biotechnology, Chemistry, and Environmental Engineering, Aalborg University, DK-9000 Aalborg, Denmark.
4. Novozymes AS, DK-2880 Bagsvaerd, Denmark.
5. Department of Chemistry, Faculty of Science, Utrecht University, 3584 CH Utrecht, Netherlands.