1. Metabolic Research Laboratories and Medical Research Council (M.Z.A., L.C.K., D.S.F.-T., L.C.P., S.K.C., G.S.H.Y., S.E.O.), Metabolic Diseases Unit, University of Cambridge, Cambridge, CB2 0QQ, UK
2. Medical Research Council Toxicology Unit (D.F.-M.), University of Leicester, Leicester, LE1 9HN, UK