1. Synthetic Biology Group, MIT Synthetic Biology Center, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA.
2. Research Laboratory of Electronics, MIT, Cambridge, MA 02139, USA.
3. Department of Electrical Engineering and Computer Science, MIT, Cambridge, MA 02139, USA.
4. Harvard-MIT Division of Health Sciences and Technology, Cambridge, MA 02139, USA.
5. Department of Biological Engineering, MIT, Cambridge, MA 02139, USA.