1. Krebs Institute for Biomolecular Research, Department of Molecular Biology and Biotechnology, The University of Sheffield, Sheffield S10 2UH, UK
2. Krebs Institute for Biomolecular Research, Department of Molecular Biology and Biotechnology, Health and Safety Laboratory, Broad Lane, Sheffield S3 7HQ, UK
3. University of Zürich, Institute for Virology, Winterthurerstr. 266a, 8057 Zürich, Switzerland
4. Laboratorio de Microbiologia Molecular, Centro de Biotechnologia, Universidade Federal do Rio Grande do Sul, Av. Bento Goncalves, 9500-Predio 43421, Campus do Vale, CEP 91501-970, Porto Alegre, Brazil
5. Krebs Institute of Biomolecular Research, Department of Chemistry, The University of Sheffield, Sheffield S10 2UH, UK
6. NIDDK; National Institutes of Health, Bethesda, MD 20892, USA