Federico Lupo1,2, Molly A Ingersoll3,4. 1. Department of Immunology, Institut Pasteur, Paris, France. 2. INSERM U1223, Paris, France. 3. Department of Immunology, Institut Pasteur, Paris, France. molly.ingersoll@pasteur.fr. 4. INSERM U1223, Paris, France. molly.ingersoll@pasteur.fr.