Fig. 2

An example of a gene family with a duplication and a horizontal transfer event found by xenoGI in a set of Vibrio species. The species tree is shown with fat gray lines. The gene tree (thin orange, blue and green lines) for this family is mapped onto that species tree according to a reconciliation performed by xenoGI. The gene family is a core family which was present in the common ancestor. There is one copy of the gene present in each strain in the ancestral genomic location of this family. That is indicated by the orange gene tree. A duplication event occurred in the lineage leading to V. cholerae and V. fluvialis, after the divergence of V. qinghaiensis (black square). This duplication resulted in another copy of the gene in a different genomic location. This was inherited in V. cholerae and V. fluvialis (blue gene tree). This also became the source of a horizontal transfer to V. parahaemolyticus (black triangle and green line) which ended up in a third genomic location