1. Center for Genome Sciences and Systems Biology, Washington University School of Medicine, St. Louis, MO 63108, USA.
2. Department of Molecular, Cellular and Developmental Biology, University of Colorado, Boulder, CO 80309, USA.
3. Department of Computer Science, University of Colorado, Boulder, CO 80309, USA.
4. Department of Medicine, Washington University School of Medicine, St. Louis, MO 63108, USA.
5. Division of Nutrition and Aging, Istituto Superiore di Sanità, Rome, Italy.
6. Architecture et Fonction des Macromolécules Biologiques, CNRS and Aix-Marseille Universities, Marseille, France.
7. Howard Hughes Medical Institute, Boulder, CO, USA.