1. Joint BioEnergy Institute, 5885 Hollis Street, Emeryville, California 94608, United States
2. Department of Biomass Science and Conversion Technology, Sandia National Laboratories, 7011 East Avenue, Livermore, California 94551, United States
3. Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States
4. Advanced Biofuels Process Development Unit, Lawrence Berkeley National Laboratory, 5885 Hollis Street, Emeryville, California 94608, United States