1. Department of Macromolecular Structures and NanoBioMedicine Initiative, Centro Nacional de Biotecnología (CNB-CIC), Darwin 3, 28049 Madrid, Spain
2. Institut Català de Recerca i Estudis Avançats (ICREA), CBATEG-Department of Biochemistry and Molecular Biology, Universitat Autonoma Barcelona, Bellaterra Barcelona, 08010, Spain
3. Department of Molecular Biology, Princeton University, Princeton, New Jersey 08544, United States
4. Departament de Física Fonamental, Facultat de Física, Universitat de Barcelona, Martí i Franqués 1, 08028 Barcelona, Spain