Affiliation: | (1) Department of Biochemistry, Queen's Medical Centre, Clifton Boulevard, NG7 2UH Nottingham, UK;(2) Department of Molecular Genetics, National Institute of Genetics, 411 Mishima, Shizuoka, Japan;(3) Present address: Department of Microbiology, University of Surrey, GU2 5X4 Guildford, Surrey, UK |