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B. fragilis/PSA activation of CD4+ T cell. PSA = Polysaccharide-A; MHC II = Major histocompatibility complex; CD = Cluster of differentiation; TCR = Toll-like receptor; IL = Interleukin; TNF-α = Tumor necrosis factor-alpha; CXCL = Chemokine ligand; IFN-γ = Interferon gamma; Th = T helper; Treg = Regulatory T cell.
