Figure 1From: Polynomial algorithms for the Maximal Pairing Problem: efficient phylogenetic targeting on arbitrary treesThree different path-systems on a tree with 15 leaves. Each path is shown in a distinctive color, and unused edges of the tree are shown as thin black lines. Clearly, no two paths share an edge, i.e., the corresponding collection of pairs of leaves is phylogenetically independent. Note that the paths are not necessarily vertex-disjoint.Back to article page