1. Department of Biosciences and Department of Chemistry; University of Oslo; Gaustadalléen 21 Forskningsparken 0349 Oslo Norway
2. Department of Chemistry and Chemical Engineering; Chalmers University of Technology, Biophysical Technology Laboratory; Kemivägen 10 Göteborg 41296 Sweden
3. Department of Biology and Biological Engineering; Chalmers University of Technology; SE-412 96 Göteborg Sweden