1. Institute
of Chemical Sciences
and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
2. Department of Biological Chemistry, University of Padua, Viale G. Colombo 3, 35131 Padua,
Italy
3. Venetian Institute of Molecular Medicine (VIMM), Via Giuseppe Orus 2, 35129
Padua, Italy
4. Laboratory of
Molecular Biology, Medical Research Council, Hills Road, Cambridge CB2
0QH, U.K.