1. Department of Chemistry & Nanoscience Center, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg, Denmark
2. Novo Nordisk Foundation Centre for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3B, 2200 Copenhagen, Denmark
3. Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
4. Novozymes A/S, 2800 Kgs. Lyngby, Denmark