%0 Journal Article %A Cao, Thien B. %A Saier, Milton H. %T Conjugal type IV macromolecular transfer systems of Gram-negative bacteria: organismal distribution, structural constraints and evolutionary conclusions %D 2001 %J Microbiology, %V 147 %N 12 %P 3201-3214 %@ 1465-2080 %R https://doi.org/10.1099/00221287-147-12-3201 %K DNA transfer %K virulence %K protein secretion %K Agrobacterium %K conjugation %I Microbiology Society, %X %U https://www.microbiologyresearch.org/content/journal/micro/10.1099/00221287-147-12-3201