Figure 1
From: Discovering local patterns of co - evolution: computational aspects and biological examples
A . A hypothetic example of a node orthologous labeling which includes gene copy number in each node of the evolutionary tree. B. A hypothetic example of an edge orthologous labeling which includes dN/dS along each edge of the evolutionary tree. C. The goal of the local co-evolutionary problem is to find large sets of orthologs that have similar patterns of evolution across large subtrees of the evolutionary tree.