1. División de Bioquímica y Biología Molecular, Facultad de Ciencias, Universidad de Alicante, Campus de San Vicente del Raspeig, 03080 Alicante, Spain
2. Centre for Metalloprotein Spectroscopy and Biology, School of Biological Sciences and School of Chemical Sciences and Pharmacy, University of East Anglia, Norwich NR4 7TJ, U.K.