1. Department of Biochemistry, University of Illinois at Urbana-Champaign, 600 South Mathews Street, Urbana, Illinois 61801, Institut für Biophysik Universität Frankfurt, Theodor-Stern-Kai 7 Haus 74, 60590 Frankfurt am Main, Germany, Department of Infectious Diseases, St. Jude Children's Research Hospital, 332 North Lauderdale Street, Memphis, Tennessee 38105-2794, Illinois EPR Research Center, 506 South Mathews Street, Urbana, Illinois 61801, Department of Chemistry, University of Illinois at Urbana...