1 Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892; eaton@helix.nih.gov pwolynes@rice.edu.
2 Department of Chemistry, Rice University, Houston, TX 77005; eaton@helix.nih.gov pwolynes@rice.edu.
3 Center for Theoretical Biological Physics, Rice University, Houston, TX 77005.