1. Max-Planck Institute
for Intelligent Systems, Heisenbergstr.
3, 70569 Stuttgart, Germany
2. Institute for
Bioengineering of Catalonia (IBEC), Baldiri I Reixac 10-12, 08028 Barcelona, Spain
3. Division
of Chemistry and Biological Chemistry, School of Physical and Mathematical
Sciences, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore, Singapore
4. Institució
Catalana de Recerca i Estudis Avançats (ICREA), Psg. Lluís Companys, 23, 08010 Barcelona, Spain