1. Center for Bio/Molecular Science
and Engineering, Code 6900
2. Institut de Biologie, Ecole Normale Supérieure, IBENS, ENS-CNRS UMR 8197, INSERUM U 1024, 46 rue d’Ulm, 75005 Paris, France
3. Departments of Cell Biology and Chemistry, The Scripps Research Institute, La Jolla, California 92037
4. Optical Sciences Division, Code 5611, U.S. Naval Research Laboratory, 4555 Overlook Ave. S.W., Washington, D.C. 20375
5. Départment de Chimie, Ecole Normale Supérieure, ENS-CNRS UMR, 8642, 24 rue Lhomond, Paris, F-75005 France
6. INSERM, U603; CNRS, UMR8154; Université Paris Descartes, Laboratory of Neurophysiology and New Microscopies, 45 rue des Saints Pères, Paris, F-75006 France