1. University of Minnesota, Department of Biochemistry, Molecular Biology and Biophysics, The Biotechnology Institute, and The Center for Microbial and Plant Genomics, 1479 Gortner Avenue, St. Paul, Minnesota 55108, USA, Fax: (+1) 612‐625‐5780
2. School of Biotechnology, Department of Biochemistry, Royal Institute of Technology (KTH), AlbaNova University Center, Roslagstullsbacken 21, 10691 Stockholm, Sweden