1. Institute of Cytology, Russian Academy of Sciences, St-Petersburg, Russia
2. Molecular Pharmacology Laboratory, Techological University, St-Petersburg, Russia
3. Department of Radiation Oncology, University of Pittsburgh School of Medicine, Hillman Cancer Center, Pittsburgh, PA
4. Department of Biochemistry, University of Leicester, Lancaster Road, Leicester, UK
5. MRC Toxicology Unit, Leicester University, Lancaster Road, Leicester, UK