1. CNRS, Université de Bordeaux, ICMCB, 87 avenue du Dr. A. Schweitzer, 33608 Pessac, France, http://www.icmcb‐bordeaux.cnrs.fr/
2. Center for Neuroscience and Cell Biology, University of Coimbra, Largo Marquês de Pombal, 3004‐517 Coimbra, Portugal
3. Department of Chemistry, CICECO, Campus Universitário de Santiago, 3810‐193 Aveiro, Portugal
4. Department of Life Sciences, Faculty of Sciences and Technology, University of Coimbra, P. O. Box 3046, 3001‐401 Coimbra, Portugal
5. Coimbra Chemistry Center, Rua Larga, University of Coimbra, 3004‐535 Coimbra, Portugal