1. Laboratory for Optical Biosciences, INSERM U451, CNRS UMR 7645, Ecole Polytechnique-ENSTA, 91128 Palaiseau Cedex, France, Service de Bioénergétique, CEA, and URA 2096 CNRS, CEA Saclay, 91191 Gif-sur-Yvette Cedex, France, Laboratoire de Bioénergétique et Ingénierie des ProtéinesCNRS, 31 chemin J. Aiguier, 13402 Marseille Cedex 20, France, and Department of Cell Biology and Genetics, Medical Genetics Centre, Erasmus University Medical Centre, PO Box 1738, 3000 DR Rotterdam, The Netherlands