1. Department of Genetics, University of Nottingham, Queens Medical Centre, Nottingham NG7 2UH, UK
2. Department of Molecular and Genetic Medicine, Section of Molecular Medicine, University of Sheffield, Royal Hallamshire Hospital, Sheffield S10 2JF, United Kingdom E-mail;
3. Department of Oncological Sciences, University of Utah, Salt Lake City, UT 84132, USA
4. Pittsburgh Bacteriophage Institute,and Department of Biological Sciences University of Pittsburgh, Pittsburgh, PA 15260, USA
5. Biophysikalische Chemie, Biozentrum der Universität Basel, Klingelbergstrasse 70, CH-4056 Basel, Switzerland