1. School of Chemistry University of Leeds Woodhouse Lane Leeds LS2 9JT UK
2. Astbury Centre for Structural Molecular Biology University of Leeds Woodhouse Lane Leeds LS2 9JT UK
3. School of Molecular and Cellular Biology University of Leeds Woodhouse Lane Leeds LS2 9JT UK
4. GlaxoSmithKline Medicines Research Centre Stevenage SG1 2NY UK