Figure 4. Dominant bacterial species identified by analysis of 16S rRNA sequences in fecal samples from six individuals. Data are from Walker et al. (2011)⁴ and represent the mean of 26 fecal samples from six obese male volunteers (4, or in one case 6, samples per person) taken during a 12 week controlled dietary study. Phylotypes corresponding to the 25 most abundant cultured bacterial species, that accounted for almost 50% of all sequences, are shown in descending order of abundance on the right hand side. The gray area on the left represents the 295 additional phylotypes (both cultured and uncultured organisms) that were detected.