1. School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia
2. Australian Research Council Centre of Excellence for Innovations in Peptide and Protein Science, The University of Sydney, Sydney, New South Wales 2006, Australia
3. Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
4. Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, California 94720, United States
5. Sydney Nano Institute, The University of Sydney, Sydney, New South Wales 2006, Australia