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Origin of the A2 Mating Type of Phytophthora infestans Outside Mexico

First author: U.S. Department of Agriculture, Agricultural Research Service, Crop Production and Pest Control Research Unit, Department of Botany and Plant Pathology, 1155 Lilly Hall, Purdue University, West Lafayette, IN 47907-1155; and second author: CRC for Tropical Plant Pathology, The University of Queensland, Brisbane 4072, Australia