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Figure 5 | BMC Evolutionary Biology

Figure 5

From: Extensive horizontal transfer of core genome genes between two Lactobacillus species found in the gastrointestinal tract

Figure 5

Two hypotheses to explain the coexistence of two tree topologies by horizontal gene transfer. Assuming that Ta represents the original species tree, dashed lines indicate the transfer events that could have generated Tb. Hypothesis (i) corresponds to an exchange between the L. acidophilus and L. johnsonii lineages. Hypothesis (ii) involves an inflow of genes from an unidentified species in the L. delbrueckii lineage. The consequences of these two hypotheses in terms of pairwise evolutionary distances are discussed in the text and compared to the data.

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