Agrobacterium: From Biology to BiotechnologyAgrobacterium is a plant pathogen which causes the crown gall disease, a neoplastic growth that results from the transfer of a well defined DNA segment (transferred DNA, or T DNA) from the bacterial Ti (tumor inducing) plasmid to the host cell, its integration into the host genome, and the expression of oncogenes contained on the T DNA. The molecular machinery, needed for T DNA generation and transport into the host cell and encoded by a series of