1. Gene Technology, Gene Technology and Applied Biochemistry, Institute of Chemical Engineering, TU Wien, Getreidemarkt 9/166/5/2, A-1060 Vienna, Austria
2. VTT Technical Research Centre, Biotechnology, FIN-02044 VTT, Espoo, Finland
3. Department of Applied Genetics and Cell Biology, University of Natural Resources and Life Sciences, Muthgasse 18, A-1190 Vienna, Austria