1. Biological Design Center, Boston University, Boston, Massachusetts 02215, United States
2. Department of Biomedical Engineering, Boston University, Boston, Massachusetts 02215, United States
3. Department of Bioengineering, Imperial College London, London SW7 2AZ, U.K.
4. Imperial College Centre for Synthetic Biology, Imperial College London, London SW7 2AZ, U.K.
5. Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, Massachusetts 02215, United States