1. Department of Biology and Biochemistry, Centre for Sustainable Chemical Technology, University of Bath, Bath BA2 7AY, U.K.
2. School of Biochemistry, University of Bristol, Bristol BS8 1TD, U.K.
3. Centre for Computational Chemistry, University of Bristol, Bristol BS8 1TS, U.K.
4. Bristol Centre for Functional Nanomaterials, School of Physics, University of Bristol, Bristol BS8 1TL, U.K.
5. School of Life Sciences, University of Essex, Colchester CO4 3SQ, U.K.