Affiliation: | 1. Department of Molecular Biology, University of Edinburgh, King's Buildings, Mayfield Road, EH9 3JR, Edinburgh, UK 2. Public Health Laboratory Service, Centre for Applied Microbiology and Research, Porton Down, SP4 OJG, Salisbury, Wiltshire, UK 3. Department of Biochemistry, UMIST, M60 1QD, Manchester, UK
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