1. Department of Plant Sciences, University of California, Davis, California 95616
2. Light Microscopy Core, University of Kentucky, Lexington, Kentucky 40536
3. Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia 30602-4712
4. Department of Biology and Skidmore Microscopy Imaging Center, Skidmore College, Saratoga Springs, New York 12866
5. Department of Plant Biology, University of Georgia, Athens, Georgia 30602-7271