1. Biochemistry & Molecular Biology Program, Departments of Biology and Chemistry, The College of Wooster, Wooster, Ohio 44691, United States
2. Department of Microbiology & Molecular Genetics, McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, Texas 77030, United States
3. Department of Biochemistry and Center for Structural Biology, Wake Forest School of Medicine, Winston-Salem, North Carolina 27101, United States