1. Laboratoire de Photocatalyse et Biohydrogène, iBiTecS, CEA, 91191 Gif sur Yvette, France, URA 2096, CNRS, 91191 Gif sur Yvette, France, and Department of Cell Biology and Genetics, MGC, Erasmus University Medical Centre, PO Box 2040, Rotterdam, 3000 CA, The Netherlands