1. Institute of Organic Chemistry
and Biochemistry, Gilead Sciences and IOCB Research Center, Academy of Sciences of the Czech Republic, Flemingovo
n. 2, 166 10, Prague 6, Czech Republic
2. Institute of Molecular Genetics, Academy of Sciences of the Czech Republic,
Vídeňská 1083, Prague 4, Czech Republic
3. Department of Infectious Diseases,
Virology, Heidelberg University, Im Neuenheimer
Feld 324, 69120 Heidelberg,
Germany