absence of plasmid dna sequences in non-tumorigenic ( crown gall tumor ) strains of agrobacterium tumefaciens was confirmed by dna-dna hybridization between purified tumor-inducing ( ti ) plasmid dnas isolated from the progenitor tumorigenic strains and 3h-labeled whole cell dnas from tumorigenic strains and their non-tumorigenic derivatives .
C0012930
tumor
C0012854
dnas