Abstract
1 Department of Virology and Belozersky Institute of Physico-Chemical Biology, Moscow State University, 119899 Moscow, Russia
2 Shemyakin & Ovchinnikov Institute of Bioorganic Chemistry, 117871 Moscow, Russia
3 Department of Plant Virology, Microbiology and Biosafety, BBA, Messeweg 11-12, D-38104 Braunschweig, Germany
4 Institute for Plant Protection in Fruit Crops, BBA, Schwabenheimer Str. 101, D-69221 Dossenheim, Germany