title: Circular DNA plasmids in Agrobacterium strains. Investigation of their role in the induction of crown-gall tumors.
mesh_terms: D002499:Centrifugation, Density Gradient; D002586:Cesium; D004269:DNA, Bacterial / Q000032:analysis*; D004270:DNA, Circular / Q000032:analysis*; D008854:Microscopy, Electron; D010941:Plant Tumors / Q000382:microbiology*; D012231:Rhizobium / Q000032:analysis* / Q000472:pathogenicity
chemical_list: D004269:DNA, Bacterial; D004270:DNA, Circular; D002586:Cesium