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Circular comparison between tet(X4)-bearing IncX1 plasmids found in this study and in the online database. The tet(X4)-bearing IncX1 plasmid pRF14-1_50k_tetX was used as the reference in the outermost ring, with the orange sector depicting the type IV secretion system (T4SS) region. Lack of T4SS would lead to loss of conjugative ability of IncX1 plasmids.
