1. Institut Pasteur, Department of Immunology, Lymphocyte Cell Biology Unit, F-75724 Paris, France
2. Centre National de la Recherche Scientifique (CNRS) URA 1961, F-75724 Paris, France
3. Institut Pasteur, Department of Cell Biology and Infection, Computational Imaging and Modeling Group, F-75724 Paris, France
4. CNRS URA 2582, F-75724 Paris, France
5. Institut Pasteur, Plateforme de Microscopie Ultrastructurale, Imagopole, F-75015 Paris, France
6. Centro de Biología Molecular Severo Ochoa, Universidad Autónoma de Madrid (CSIC-UAM), Cantoblanco, 28049 Madrid, Spain