1. Department of Chemical Engineering, University of California, Santa Barbara, California 93106, United States
2. Environmental Research and Innovation Department, Luxembourg Institute of Science and Technology, L-4422 Belvaux, Luxembourg
3. Department of Bioengineering, University of California, Santa Barbara, California 93106, United States
4. Joint BioEnergy Institute (JBEI), Emeryville, California 94608, United States