1. Institute of Microbiology, Academy of Sciences of the Czech Republic, Vídenská 1083, 142 20 Prague 4, Czech Republic
2. Institute of Experimental Botany, Academy of Sciences of the Czech Republic, Sokolovská 6, 772 00 Olomouc, Czech Republic
3. Institute of Plant Biochemistry, P.O. Box 110432, D-06018 Halle, Germany
4. School of Biological Sciences, Royal Holloway, University of London, Surrey, United Kingdom
5. Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Vídenská 1083, 142 20 Prague 4, Czech Republic