Figure 3. Bacterial populations in ulcerated mucosa of treatment-naïve or treated patients with IBD. Bars represent mean ± SEM of the relative difference which is the fold amplification of sequences for the target population relative to amplification of universal bacterial domain sequences. significant differences (unpaired t test with Welch's correction) are indicated in the Figure. Bacteroides-Prevotella-Porphyromonas and Enterobacteriaceae are depicted on the left Y-axis; the remaining bacterial populations are depicted on the right Y-axis. BP, Bacteroides-prevotella-Porphyromonas; EB, Enterobacteriaceae ; BB, Bifidobacteria; CL, Clostridium leptum; CC, Clostridium coccoides; LB, Lactobacillus.