[1] Lawrence Berkeley Natl Lab, Ctr Environm Biotechnol, Berkeley, CA 94720 USA
[2] DOE Joint Genome Inst, Microbiol Ecol Program, Walnut Creek, CA 94598 USA
[3] Danish Genome Inst, DK-8000 Aarhus, Denmark
[4] Baylor Univ, Dept Bioinformat, Waco, TX 76798 USA
[5] Univ Calif Berkeley, Dept Bioengn, Berkeley, CA 94720 USA
[6] Univ Queensland, Dept Biochem, Brisbane, Qld 4072, Australia
[7] Univ Queensland, Dept Math, Brisbane, Qld 4072, Australia
[8] Chalmers Univ Technol, Dept Comp Sci, SE-41296 Gothenburg, Sweden