1. National Bioenergy Center, National Renewable Energy Laboratory, Golden, Colorado 80401, United States
2. National Advanced Biofuels Consortium, National Renewable Energy Laboratory, Golden, Colorado 80401, United States
3. Biosciences Center, National Renewable Energy Laboratory, Golden, Colorado 80401, United States
4. Department of Chemistry, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K.
5. Department of Chemical Engineering, Colorado School of Mines, Golden, Colorado 80401, United States