1. Laboratoire d'Optique Appliquée, INSERM U451, CNRS URA 1406, Ecole Polytechnique-ENSTA, 91120 Palaiseau, France, Krebs Institute for Biomolecular Research and Robert Hill Institute for Photosynthesis, Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, Sheffield, S10 2UH, United Kingdom, and SBE/DBCM, CEN de Saclay, 91191 Gif-sur-Yvette Cedex, France