1. CEA, iBiTecS, Service de Bioénergétique Biologie Structurale et Mécanismes, 91191 Gif-sur-Yvette, France
2. CNRS, URA 2096, 91191 Gif-sur-Yvette, France
3. Department of Cell Biology and Genetics, Medical Genetics Centre, Erasmus University Medical Centre, P.O. Box 2040, 3000 CA Rotterdam, The Netherlands