1. EMBL Australia Node for Single Molecule Science, School of Medical Sciences, University of New South Wales Sydney 2052, Australia
2. Physical & Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom
3. School of Physics, University of New South Wales, Sydney 2052, Australia
4. Department of Bioengineering and Centre for Synthetic Biology, Imperial College London, London SW7 2AZ, United Kingdom
5. ARC Centre of Excellence in Synthetic Biology, University of New South Wales, Sydney, Australia