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Overview of T cell physiology. CD, cluster of differentiation; CRS, chronic rhinosinusitis; CRSsNP, CRS without nasal polyps; CRSwNP, CRS with nasal polyps; IFN, interferon; IgE, immunoglobulin E; IL, interleukin; ILC, innate lymphoid cell; Tc, cytotoxic T cell; Tfh, T follicular helper cell; TGF, tumor growth factor; Th, T helper cell; TLR, Toll like receptor; TNF, tumor necrosis factor; Treg, regulatory T cell.
