1. Integrated Microbial Biodiversity Program, Canadian Institute for Advanced Research, Department of Biochemistry and Molecular Biology, Dalhousie University, Halifax, Nova Scotia, Canada
2. Biosciences Directorate, Lawrence Livermore National Laboratory, Livermore, California
3. Joint Genome Institute, Walnut Creek, California
4. Department of Biology, Faculty of Science, Yamagata University, 1-4-12 Kojirakawa, Yamagata, Japan