1. School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K.
2. Leeds Institute of Cardiovascular and Metabolic Medicine (LICAMM), School of Medicine, University of Leeds, Leeds LS2 9JT, U.K.
3. Faculty of Biological Sciences and Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds LS2 9JT, U.K.
4. UCB, Slough, SL1 3WE, U.K.