Figure 4.

Clustering results of the mammalian gut samples based on 5-tuples and dissimilarity measure d₂^S|M₀: (a) without the omnivore samples; (b) with the omnivore samples. Green upward triangles: foregut-fermenting herbivore; yellow downward triangles: hindgut-fermenting herbivore; red discs: simple-gut carnivore; blue squares: simple-gut omnivore.