Abundance of Faecalibacterium prausnitzii, a dominant bacterium of the human microbiota that exhibits antiinflammatory effects, is decreased in patients with inflammatory bowel diseases (IBD). In humans, colonic lamina propria contains IL-10-secreting, Foxp3- Tregs characterized by a double expression of CD4 and CD8α (DP8α) and a specificity for F. prausnitzii.
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