1. UT/ORNL Center for Molecular Biophysics, Oak Ridge National Laboratory, Oak Ridge, Tennessee37831, United States
2. Department of Biochemistry and Cellular and Molecular Biology, University of Tennessee, Knoxville, Tennessee37996, United States
3. Department of Medicine, College of Medicine, University of Tennessee Health Science Center, Memphis, Tennessee38163, United States
4. Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee37831, United States