1. Cereals Program, National Agricultural Research Organization; National Crops Resources Research Institute, Namulonge, P. O. Box 7084 Kampala, Uganda
2. International Maize and Wheat Improvement Center (CIMMYT), P.O. Box 1041-00621, Nairobi, Kenya
3. USDA ARS Corn Host Plant Resistance Research Unit, Mississippi State, MS 39762.
4. Molecular and Cellular Imaging Center, Ohio State University, Columbus, OH, 43210