1. Life Science Department, Center for Neuroscience B.R.A.I.N., University of Trieste, via Giorgieri 1, I-34127 Trieste, Italy
2. SENIL, ELETTRA Synchrotron Light Source, I-34127 Trieste, Italy
3. Department of Chemical and Pharmaceutical Sciences, University of Trieste, Piazzale Europa 1, I-34127 Trieste, Italy