1. Lymphocyte Activation Unit, Division of Immunology, Transplantation and Infectious Diseases, San Raffaele Scientific Institute, Milan, Italy
2. Cell Adhesion Unit, Division of Neuroscience, San Raffaele Scientific Institute, Milan, Italy
3. Department of Pathology, University of Brescia Medical School, Brescia, Italy
4. Pathology Unit, San Raffaele Scientific Institute, Milan, Italy
5. Vita‐Salute San Raffaele University, Milan, Italy