Affiliation: | 1. Dipartmento di Chimica “G. Ciamician”, Alma Mater Studiorum, Università di Bologna, Via Selmi 2, 40126 Bologna (Italy), Fax: (+39)?051‐2099456;2. Laboratory for Biomolecular Modeling, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1050 Lausanne (Switzerland) |