Fig 2.

Neighbor-joining phylogenetic tree showing the relationship between cultured F. prausnitzii strains and directly amplified partial 16S rRNA gene sequences from human fecal samples. 16S rRNA sequence accession numbers are given in parentheses. Squares indicate OTU representative sequences from two recent studies on gut microbiota of healthy subjects (shown in boldface): the Tap et al. (53) study (1,443 F. prausnitzii sequences out of 10,456 clones from 17 healthy adults of both sexes) and the Walker et al. (57) study (534 F. prausnitzii sequences out of 5,915 total sequences from six obese males). The percentage of all clones represented by each OTU in each of these studies is shown on the right.