1. D. I. Ivanovsky Institute of Virology, 123098 Moscow, Russia and Swedish Institute for Infectious Disease Control and Microbiology and Tumor Biology Center, Karolinska Institute, SE-17182 Stockholm, Sweden
2. W. A. Engelgardt Institute of Molecular Biology, 117984 Moscow, Russia
3. D. I. Ivanovsky Institute of Virology, 123098 Moscow, Russia
4. Swedish Institute for Infectious Disease Control and Microbiology and Tumor Biology Center, Karolinska Institute, SE-17182 Stockholm, Sweden