1. a Institute of Biochemistry , D-06120 Halle (Saale), Germany Phone: Fax: E-mail:
2. e Moscow State University, Faculty of Chemistry , 119899 , Moscow , Russia
3. c Friedrich Schiller University, Institute of Virology , D-07745 , Jena , Germany
4. d Friedrich Schiller University, Department of Molecular Biology , D-07745 , Jena , Germany
5. b Department of Oto- , Rhino-, Laryngology, Face and Neck Surgery , D-06110 , Halle (Saale), Germany