Figure 1.

A phylogenetic network. The network was generated by Neighbor-Net for a sequence-based data set comprising of Salmonella isolates that originally appeared in [17]. A detailed network-based analysis of this data is presented in [2], where the strains indicated in bold-face are tested for the presence of recombination. Note that the network is planar (that is, it can be drawn in the plane without any crossing edges), and that parallel edges in the network represent bipartitions of the data.