1. Department of Plant and Environmental Sciences, Section for Glycobiology, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg C, Denmark
2. Department of Geosciences and Natural Resource Management, University of Copenhagen, 1958 Frederiksberg, Denmark
3. Department of Biological and Agricultural Engineering, University of California Davis, One Shields Avenue, Davis, California 95616, United States