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Polysaccharide A (PSA) from the capsule of Bacteroides fragilis can induce MHCII-dependent CD4 + T cell expansion; PSA was the first identified non-peptide antigen capable of exerting this kind of response and revealing a role for polysaccharides as antigens
Bacterial Polysaccharide A (PSA) induces secretion of IL-10 from [C…