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Comparison of DNA transfer regions of conjugative plasmids (A) F, (B) Ptw, and (C) R388, highlighting structural and sequence homologies. Homologous ORFs are highlighted in a color-coded format: T4SS genes are shown in green, relaxases in blue, and coupling proteins in orange. Ptw genes are named based on their closest homologs in F and R388 plasmids.
