1. VTT Technical Research Centre of Finland Ltd., VTT, P.O. Box 1000, FI-02044 Espoo, Finland
2. Molecular Plant Biology, Department of Life Technologies, University of Turku, FI-20014 Turku, Finland
3. Department of Applied Physics, Aalto University, FI-00076 Espoo, Finland
4. Department of Bioproducts and Biosystems, Aalto University, FI-00076 Espoo, Finland