1. Department of Organic and Biological Chemistry, School of Chemistry, University of Bristol, Bristol BS8 1TS, UK.
2. Cancer Research UK Tumour Growth Control Group, Oxford Molecular Pathology Institute, Sir William Dunn School of Pathology, University of Oxford, Oxford OX1 3RE, UK.
3. School of Molecular and Biomedical Science, University of Adelaide, Adelaide 5005, Australia.
4. School of Biology and Environmental Science, University College Dublin, Belfield, Dublin, Ireland.
5. Canada’s Michael Smith Genome Sciences Centre, British Columbia Cancer Agency, Vancouver, Canada.
6. Cancer Research UK Receptor Structure Research Group, Division of Structural Biology, Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford OX3 7BN, UK.