1. Centre for Biomolecular Sciences; School of Life Sciences; University of Nottingham; University Park Nottingham NG7 2RD UK
2. Division of Genetics and Molecular Biology; Institute of Biological Sciences; Faculty of Science; University of Malaya; Kuala Lumpur 50603 Malaysia
3. Institute of Molecular Microbiology and Biotechnology; University of Muenster; D-48149 Muenster Germany