1. The Roslin Institute and Royal (Dick) School of Veterinary Studies, Univ. of Edinburgh; Easter Bush Research Center; Midlothian EH25 9RG UK
2. Global Wheat Program; International Maize and Wheat Improvement Center (CIMMYT); Apdo. 06600 México D.F. México
3. Biometrics and Statistics Unit; International Maize and Wheat Improvement Center (CIMMYT); Apdo. 06600 México D.F. México
4. Genetic Resources Program; International Maize and Wheat Improvement Center (CIMMYT); Apdo. 06600 México D.F. México
5. Global Maize Program; International Maize and Wheat Improvement Center (CIMMYT); Apdo. 06600 México D.F. México
6. Center for Biotechnology Research; Advanta Semillas; Ruta 226 Km 60.5 7620 Balcarce Argentina
7. Saaten Union Recherche; 160 Avenue de Flandre 60190 Estrées Saint Denis France
8. University of Ljubljana; Domzale Slovenia