1. Centre for Metalloprotein Spectroscopy and Biology, School of Chemical Sciences and Pharmacy, University of East Anglia, Norwich NR4 7TJ, U.K.
2. Centre for Metalloprotein Spectroscopy and Biology, School of Biological Sciences, University of East Anglia, Norwich NR4 7TJ, U.K.
3. School of Biosciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, U.K.