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Interindividual variation in the proportion of major phyla (A), Clostridium clusters (B), and the genera Faecalibacterium and Ruminococcus (C) in 187 fecal samples from elderly subjects. Only the seven largest phyla are shown in A. Samples are ordered, from left, according to their Bacteroidetes proportion (A), cluster IV proportion of all reads assigned to Clostridium clusters (B), and Faecalibacterium proportion (C) to illustrate the dramatic interindividual variation.
