Institution: | 1. Max-Planck-Institut für Züchtungsforschung, Egelspfad, D-5000, K?ln 30, Federal Republic of Germany 2. Biologie II, Universit?t Freiburg, D-7800, Freiburg, Federal Republic of Germany 3. John Innes Institute, Norwich, Great Britain 4. Department of Agronomy, Iowa State University, Ames, Iowa, USA
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