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Alignment of the C termini of TrbJ and TrbK proteins of selected conjugation systems. Sequence similarities between TrbJ and TrbK pairs were obtained using the MegAlign program (DNASTAR). Colons indicate conservative substitutions. R. leguminosarum, Rhizobium leguminosarum; A. rhizogenes, Agrobacterium rhizogenes; R. etli, Rhizobium etli; E. coli, Escherichia coli.
