1Center for Environmental Biotechnology, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Mail Stop 70A-3317, Berkeley, California 94720
2Microbial Ecology Program, DOE Joint Genome Institute, 2800 Mitchell Drive, Bldg. 400-404, Walnut Creek, California 94598
3Danish Genome Institute, Gustav Wieds vej 10 C, DK-8000 Aarhus C, Denmark
4Department of Bioinformatics, Baylor University, P.O. Box 97356, 1311 S. 5th St., Waco, Texas 76798-7356
5Department of Bioengineering, University of California, Berkeley, California 94720
6Departments of Biochemistry and Mathematics, The University of Queensland, Brisbane, Queensland 4072, Australia
7Department of Computer Science, Chalmers University of Technology, SE-412 96 Göteborg, Sweden