Affiliation: | aMedical Research Council Harwell, Harwell Science and Innovation Campus, Oxfordshire OX11 0RD, United Kingdom;;bDivision of Neurobiology, Medical Research Council Laboratory of Molecular Biology, Cambridge Biomedical Campus, Cambridge CB2 0QH, United Kingdom;;cDepartment of Chemistry and Biochemistry, University of California, Santa Cruz, CA, 95064 |