1. Systems, Synthetic and Physical Biology Program, Rice University, Houston, Texas, USA
2. Department of Biology and Biochemistry, University of Houston, Houston, Texas, USA
3. Department of Bioengineering, Rice University, Houston, Texas, USA
4. Department of Chemistry, Rice University, Houston, Texas, USA
5. Department of Biosciences, Rice University, Houston, Texas, USA
6. Center for Theoretical Biological Physics, Rice University, Houston, Texas, USA