Affiliation: | 1 Department of Chemistry and Biochemistry, Utah State University, Logan, UT 84322-0300, USA 2 Department of Biochemistry, University of Utah, Salt Lake City, UT 84112-5650, USA 3 Department of Biology, Brookhaven National Laboratory, Upton, NY 11973, USA 4 Division of Infectious Diseases, Children's Hospital, Harvard Medical School, Boston, MA 02115, USA |