1. Department of Biochemistry and Molecular Biology University of Melbourne Parkville Victoria 3010 Australia
2. Bio21 Molecular Science and Biotechnology Institute University of Melbourne Parkville Victoria 3010 Australia
3. Current Address: Department of Biochemistry and Molecular Biology School of Biomedical Sciences Monash University Clayton Victoria 3800 Australia
4. Current Address: New Technologies Development Department Kaneka Eurogentec S.A. Biologics Division 14 Rue Bois Saint-Jean 4102 Seraing Belgium