1. Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
2. Biochemistry Division, University of Missouri, Columbia, Missouri 65211
3. Smithsonian Environmental Research Center, Edgewater, Maryland 21037
4. Bioscience Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
5. DOE Joint Genome Institute, Walnut Creek, California 94598