1. D. A. Rozwarski, Department of Biochemistry and Biophysics, Texas A&M University, College Station, TX 77843, USA.
2. G. A. Grant, Department of Molecular Biology and Pharmacology, Washington University School of Medicine, St. Louis, MO 63110, USA.
3. D. H. R. Barton, Department of Chemistry, Texas A&M University, College Station, TX 77843, USA.
4. W. R. Jacobs Jr., Department of Microbiology and Immunology and Howard Hughes Medical Institute, Albert Einstein College of Medicine, Bronx, NY 10461, USA.
5. J. C. Sacchettini, Department of Biochemistry and Biophysics and Department of Chemistry, Texas A&M University, College Station, TX 77843, USA.