1. Department
of Plant Biology, Carnegie Institution for Science, Stanford, California 94305, United States
2. Institute
of Biosciences and Bioresources (CNR-IBBR), National Research Council of Italy, Palermo 90129, Italy
3. Department
of Botany, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
4. Max Planck Institute
for Molecular Plant Physiology, Potsdam 14476, Germany
5. Joint
BioEnergy Institute and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
6. Department
of Plant and Environmental Sciences, University of Copenhagen, Copenhagen C-1871, Denmark
7. ARC Centre
of Excellence in Plant Cell Walls, School of Botany, The University of Melbourne, Melbourne, Victoria 3010, Australia