1. Department of Microbiology and Center for Biocatalysis and Bioprocessing, The University of Iowa, Iowa City, Iowa
2. Institute of Biotechnology, University of Cambridge, Cambridge, United Kingdom
3. Institute of Biotechnology, Swiss Federal Institute of Technology (ETH), Zurich, Switzerland
4. Department of Biochemistry, Molecular Biology and Biophysics, Biotechnology Institute, University of Minnesota, St. Paul, Minnesota