1. Department of Plant Biology, Carnegie Institution for Science, CA 94305, USA.
2. Department of Physics, Pennsylvania State University, University Park, PA 16802, USA.
3. Department of Plant Pathology, Physiology, and Weed Science, Virginia Polytechnic University and State University, Blacksburg, VA 24061, USA.
4. Department of Biology, Pennsylvania State University, University Park, PA 16802, USA.
5. Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, MD 20742, USA.
6. Cell and Developmental Biology Section, Division of Biological Sciences, University of California, San Diego, La Jolla, CA 92093, USA.
7. Department of Biological Sciences, University of North Texas, Denton, TX 76203, USA.
8. Michigan State University–U.S. Department of Energy (MSU-DOE) Plant Research Laboratory and Department of Computer Science and Engineering, Michigan State University, East Lansing, MI 48824, USA.
9. Center for Plant Aging Research, Institute for Basic Science, Department of New Biology, Daegu Gyeongbuk Institute of Science and Technology, Daegu 711-873, Republic of Korea.