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Figure 1.

The four possible quartet topologies. The four possible quartet topologies of species a, b, c, d. Topologies (a): ab|cd, (b): ac|bd, and (c): ad|bc are butterfly quartets, while topology (d): Math, is a star quartet.

Christiansen et al. Algorithms for Molecular Biology 2006 1:16   doi:10.1186/1748-7188-1-16
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