1. Department of Biology and Biochemistry, University of Bath, Bath BA2 7AY, U.K.
2. Department of Chemistry, University of Bath, Bath BA2 7AY, U.K.
3. Science for Life Laboratory, Department of Chemistry − BMC, Uppsala University, Uppsala 752 37, Sweden
4. Department of Chemistry and Biology, University of Gothenburg, Göteborg 412 96, Sweden
5. School of Science, University of Waikato, Hamilton 3216, New Zealand
6. Department of Biochemistry, University of Bristol, Bristol BS8 1TD, U.K.