1 School of Molecular Bioscience, University of Sydney, New South Wales 2006, Australia.
2 School of Molecular Bioscience, University of Sydney, New South Wales 2006, Australia; Bragg Institute, Australian Nuclear Science and Technology Organisation, New South Wales, Australia.
3 School of Molecular Bioscience, University of Sydney, New South Wales 2006, Australia. Electronic address: jill.trewhella@sydney.edu.au.