| organization and functional analysis of three t-dnas from the vitopine ti plasmid ptis4. | the vitopine ti plasmid ptis4 of agrobacterium vitis has an unusual t-dna organization. the ptis4 oncogenes, localized by screening selected ptis4 clones for growth-inducing activity, are localized on three t-dnas, whereas in all other characterized ti plasmids one or two t-dnas are found. the nucleotide sequences and predicted amino acid sequences of the ptis4 oncogenes set them apart from the corresponding genes from other ti or ri plasmids. the oncogenes induce the same type of reaction on va ... | 1992 | 1465104 |