1. Saint Petersburg State University, Universitetskaya Nab., 7/9, Saint Petersburg 199034, Russia
2. Peter the Great Saint Petersburg Polytechnic University, Polytechnicheskaya, 29, Saint Petersburg 195221, Russia
3. Institute of Cytology of the Russian Academy of Sciences (RAS), Tikhoretsky Ave., 4, Saint Petersburg 194064, Russia
4. Saint-Petersburg Pasteur Institute of Epidemiology and Microbiology, 14 Mira Street, Saint Petersburg 197101, Russia