1. Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
2. Department of Plant and Microbial Biology, University of California, Berkeley, California 94720
3. CEA, CNRS UMR 7265, Biologie Végétale et Microbiologie Environnementales, Aix-Marseille Université, Laboratoire d’Ecophysiologie Moléculaire des Plantes, Saint-Paul-lez-Durance 13108, France
4. Howard Hughes Medical Institute, University of California, Berkeley, California 94720