1. Institute for Molecular Bioscience, The University of Queensland, St Lucia, Queensland 4072, Australia
2. School of Chemistry, The University of Sydney, Camperdown, New South Wales 2006, Australia
3. Australian Research Council Centre of Excellence for Innovations in Peptide and Protein Science, The University of Sydney, Camperdown, New South Wales 2006, Australia
4. Molecular Medicine Program, Research Institute, The Hospital for Sick Children, Toronto, Ontario M5G 0A4, Canada
5. School of Pharmacy, The University of Queensland, Woolloongabba, Queensland 4102, Australia
6. Center for Cancer Research, National Cancer Institute, Frederick, Maryland 21702-1201, United States
7. Genentech, 1 DNA Way South San Francisco, California 94080, United States