[1] WT MRC Cambridge Stem Cell Inst, Cambridge, England
[2] Univ Cambridge, Dept Chem, Cambridge, England
[3] Univ Cambridge, Inst Biotechnol, Dept Chem Engn & Biotechnol, Cambridge, England
[4] Univ Cambridge, Inst Publ Hlth, Dept Publ Hlth & Primary Care, Cambridge, England
[5] Univ Cambridge, Dept Biochem, Cambridge, England
[6] Univ Cambridge, Dept Clin Neurosci, Cambridge, England