1. Department of Molecular Pharmacology, Physiology, and Biotechnology, Brown University, Providence, Rhode Island, USA
2. DOE Joint Genome Institute, Walnut Creek, California, USA
3. Los Alamos National Laboratory, Bioscience Division, Los Alamos, New Mexico, USA
4. Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA
5. Department of Chemistry, Brown University, Providence, Rhode Island, USA