1. Department of Chemical Engineering, University of California, Berkeley, California 94720
2. Joint BioEnergy Institute, Emeryville, California 94608
3. Department of Molecular and Cellular Biology, University of California, Berkeley, California 94720
4. Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
5. Department of Bioengineering, University of California, Berkeley, California 94720