single T-DNA borders. Genetic analysis of integration mediated by

This mutation therefore, resulted in aphenotypesimilartootherinsertionsingene2(23)andintheformation ofgreen, shoot-forming tumors on tobacco (Fig.3). Thesetumorsalso containedbothoctopineandnopaline.The phenotype of tumors induced by these three plasmidmutants reinforced earlier observations that the nos genecould beexpressed froma variety ofabnormalpositions onaT-DNA(26).In these