[1] Univ Milan, Dept Pharmacol, B Ceccarelli Ctr Neurobiol, Milan, Italy
[2] CNR, Ctr Mol & Cellular Pharmacol, I-20133 Milan, Italy
[3] Ist Sci San Raffaele, DIBIT, I-20132 Milan, Italy
[4] Univ Padua, CNR, Ctr Biomembranes, Dept Biomed Sci, I-35100 Padua, Italy