1 1] Physico-Chimie Curie, Institut Curie, Paris Sciences Lettres, CNRS UMR 168, Université Pierre et Marie Curie-Paris 6, Paris, France. [2] Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, Virginia, USA.
2 1] Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, Virginia, USA. [2] Institut Pasteur, Physics of Biological Systems, CNRS UMR 3525, Paris, France.