Fig. 4From: Differences in gut microbial composition correlate with regional brain volumes in irritable bowel syndromeGroup differences in the relative abundance of microbiota. Bar graphs depict the Firmicutes to Bacteroidetes ratio (a), the mean relative abundance for identifiable operational taxonomic units (b), and taxa demonstrating group differences at each taxonomic level (phylum, class, order, family, and genus (c-f)). Error bars represent standard deviationsBack to article page