Distribution of two Agrobacterium tumefaciens insertion elements in natural isolates: Evidence for stable association between Ti plasmids and their bacterial hosts
1. Institut de Biologie Mo?eculaire des Plantes du CNRS, Rue du Général Zimmer 12, F-67084, Strasbourg, France 2. INRA, Route St. Clément, F-49070, Beaucouze, Angers, France