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Clustering results of the mammalian gut samples based on 5-tuples and dissimilarity measure d2S|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.
