1. School of Physics, Georgia Institute of Technology, Atlanta, GA, USA.
2. Robotics Institute, Carnegie Mellon University, Pittsburgh, PA, USA.
3. National Institute for Mathematical and Biological Synthesis, University of Tennessee, Knoxville, TN, USA.
4. Department of Biological Sciences, Clemson University, Clemson, SC, USA.
5. School of Biology, Georgia Institute of Technology, Atlanta, GA, USA.