1. Department of Biological Science and Institute of Molecular Biophysics, Florida State University, Tallahassee, FL 32306
2. Department of Molecular, Cellular and Developmental Biology, University of Colorado, Boulder, CO 80309
3. Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, TX 75390
4. Department of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO 80045