1. Department
of Crystallography and Structural Biology, Inst. Química-Física “Rocasolano”, CSIC, Serrano 119, 28006 Madrid, Spain
2. Department
of Chemistry and Biochemistry, Nieuwland Science Hall, University of Notre Dame, Notre
Dame, Indiana 46556, United States
3. Instituto de Biología Molecular de Barcelona, CSIC, Baldiri Reixach 13, 08028 Barcelona, Spain
4. ICREA (Institucio
Catalana de Recerca y Estudis Avançats), Passeig lluís Companys 23, 08010 Barcelona, Spain