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Type IV hypersensitivity reactions are mediated by which molecule?

Type IV hypersensitivity reactions are mediated by which molecule? Correct Answer T cells

Type IV hypersensitivity reactions are mediated by subpopulation of T cells i.e. CD4 Th1 cells. They encounter certain type of antigens and produce cytokines which results in induction of inflammatory reactions. These inflammatory reactions are localised and are mediated by specific inflammatory cells like macrophages. 

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