1. Department of Biological‐ and Environmental Sciences University of Gothenburg Box 461 Göteborg SE‐405 30 Sweden
2. Department of Glycoscience School of Biotechnology KTH Royal Institute of Technology Stockholm SE‐106 91 Sweden
3. Department of Plant Molecular Biology University of Lausanne Biophore, 1015 Lausanne Switzerland
4. Department of Pure and Applied Biochemistry Lund University Lund SE‐221 00 Sweden