1. Department of Biology, University of Massachusetts Amherst, Amherst, MA 01003
2. Program in Molecular and Cellular Biology, University of Massachusetts Amherst, Amherst, MA 01003
3. Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213
4. Lane Center for Computational Biology, Carnegie Mellon University, Pittsburgh, PA 15213
5. Department of Physics, University of Massachusetts Amherst, Amherst, MA 01003