1. Associated Unit CSIC “Peptides & Proteins: physicochemical studies” Physicochemistry Department, Faculty of Pharmacy, Av. Joan XXIII s.n. 08028 Barcelona, Spain, Department of Peptide & Protein Chemistry, IIQAB-CSIC, Jordi Girona Salgado 18-26, 08034 Barcelona, Spain, and Department of Physical Chemistry, Faculty of Pharmacy, University of Santiago de Compostela, 15706 Santiago de Compostela, Spain