1. Université Pierre et Marie Curie-Paris 06, UMRS 974, Paris F-75013, France.
2. INSERM, U974, Institut de Myologie, Paris F-75013, France.
3. CNRS, UMR 7215, Institut de Myologie, Paris F-75013, France.
4. Department of Physiology, Anatomy, and Genetics, University of Oxford, OX1 3QX Oxford, United Kingdom.
5. Unité des Cytokines et Développement Lymphoide, Institut Pasteur, Paris F-75015, France.
6. Stem Cell Laboratory of the Centro Dino Ferrari, Department of Neurological Sciences, Fondazione IRCCS Policlinico of Milan, University of Milan, 20122 Milan, Italy.