Figure 2.

(a) A rooted, bifurcating phylogenetic tree T built on five taxa labeled with a, b, c, d and e. The internal nodes are shown with x0, x1, x2 and x3. (b) A clade of T rooted at x1. (b) and (c) Two subtrees of T by contracting the taxa sets {d, e} and {a, e}.

Ramu et al. BMC Bioinformatics 2012 13:256   doi:10.1186/1471-2105-13-256
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