1. Department
of Cell Biology, School of Medicine, Yale University, 333 Cedar
Street, New Haven, Connecticut 06520, United States
2. Nanobiology
Institute, Yale University, West Haven, Connecticut 06516, United States
3. Laboratoire
de
Physique Statistique, UMR CNRS 8550 Associée aux Universités
Paris 6 et Paris 7, Ecole Normale Supérieure, 24 Rue Lhomond, 75005 Paris, France