Mobilization frequency (MF) in the presence of TZA-B.

<p>MF of three mobilizable plasmids in the presence of 0.4 mM TZA-B (TZA-B, blue squares) or in its absence (C+, orange circles), using four different helper plasmids. Each point represents the result of one independent experiment in logarithmic scale measured by plate-conjugation assay. Horizontal and vertical bars represent the mean ± SD of each group of data (** p < 0.01, *** p < 0.001). ^<i>a</i> CFs of helper plasmids in the presence of mobilizable plasmids were similar to that obtained alone (<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0148098#pone.0148098.g004" target="_blank">Fig 4</a>).