1. Energy Technologies Area, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA
2. Joint BioEnergy Institute, 5885 Hollis Street, Emeryville, CA 94608, USA
3. Biosciences Area, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA
4. Energy & Biosciences Institute, University of California, Berkeley, CA 94720, USA