1. Department of Biosciences, University of Milan, via Celoria 26, 20133, Milan, Italy
2. Biology of the Neuromuscular System, INSERM IMRB U955-E10, UPEC, ENVA, EFS, Creteil 94000, France
3. Stem Cells & Development, Dept. of Developmental & Stem Cell Biology, Institut Pasteur, Paris, 75015 France
4. CNRS UMR 3738, Institut Pasteur, Paris, 75015 France