[1] Univ Newcastle Upon Tyne, Sch Med, Med Mol Biol Grp, Dept Med, Newcastle Upon Tyne NE2 4HH, Tyne & Wear, England
[2] Univ Newcastle Upon Tyne, Sch Med, Liver Res Ctr, Newcastle Upon Tyne NE2 4HH, Tyne & Wear, England
[3] Univ Newcastle Upon Tyne, Sch Med, Dept Biochem & Genet, Newcastle Upon Tyne NE2 4HH, Tyne & Wear, England
[4] Univ Newcastle Upon Tyne, Sch Med, Dept Pathol, Newcastle Upon Tyne NE2 4HH, Tyne & Wear, England
[5] Univ York, Dept Chem, Prot Struct Res Lab, York YO1 5DD, N Yorkshire, England
[6] St Jude Childrens Res Hosp, Dept Mol Pharmacol, Memphis, TN 38105 USA
[7] Univ Leicester, Dept Biochem, Leicester LE1 7RH, Leics, England