1. California Institute for Quantitative Biosciences, University of California, Berkeley, Berkeley CA 94720, USA and Joint BioEnergy Institute, Emeryville, CA 95608, USA.
2. Synthetic Biology Engineering Research Center and Department of Bioengineering, University of California, Berkeley, CA 94720, USA.
3. Department of Chemical and Biomolecular Engineering, University of California, Berkeley and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.