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Proportional representation of Gram-negative phyla in fecal samples from different mammals. Bacterial composition of mammalian fecal samples, as previously reported (Ley et al., 2008a), are represented as the proportion of phyla composed of Gram-negative (red) and Gram-positive (purple) bacteria. Host animals’ gut morphologies are indicated and color coded (FG, foregut fermenter in green; S, simple in yellow; HG, hindgut fermenter in red).
