Center for Biological Sequence Analysis, Department of Systems Biology, The Technical University of Denmark, DK-2800 Lyngby, Denmark.|Comparative Genomics Group, Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA.|Comparative Genomics Group, Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA.|Assays, Culture and Enzymes Division, DK-2970?Hxc3xb8rsholm, Denmark.