1. 1Department of Structural Biology, Stanford University School of Medicine, Stanford, California.
2. 2Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, California.
3. 3Institute of Anatomy, University Hospital, University Duisburg-Essen, Essen, Germany.
4. 4CRCM, Immunity and Cancer, Inserm, U1068, Institut Paoli-Calmettes, Aix-Marseille Université, UM105, CNRS, UMR7258, Marseille, France.