1. School of Chemical Engineering University of New South Wales (UNSW Sydney) Sydney NSW 2052 Australia
2. Electron Microscopy Unit University of New South Wales (UNSW) Sydney NSW 2052 Australia
3. School of Biomedical Sciences University of New South Wales (UNSW) Sydney NSW 2052 Australia
4. EMBL Australia Node in Single Molecule Science Department of Molecular Medicine School of Biomedical Sciences University of New South Wales (UNSW) Sydney NSW 2052 Australia