Affiliation: | Department of Microbiology, University of Washington School of Medicine, Seattle, Washington 98195-7242,1. J. Craig Venter Institute, Rockville, Maryland 20850,2. Department of Biochemistry and Molecular Biology, George Washington University School of Medicine and Health Sciences, Washington, DC 20037,3. Department of Pharmacology, Program in Biomolecular Structure, University of Colorado Denver School of Medicine, Aurora, Colorado 800454. |