1. Raytheon BBN Technologies, Cambridge, Massachusetts United States
2. Center
of Synthetic Biology, Boston University, Boston, Massachusetts 02215, United States
3. Department
of Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
4. Department
of Chemistry and Biochemistry, University of California Los Angeles, Los
Angeles, California 90095-1570, United States
5. Department
of Microbiology, Immunology and Molecular Genetics, University of California Los Angeles, 609 Young Drive, Box 148906, Los Angeles, California 90095-1570, United States