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Superantigens are a unique class of antigens that provoke an unusually strong immune response by directly linking major histocompatibility complex (MHC) class II molecules on antigen-presenting cells with T-cell receptors (TCRs) on T lymphocytes, bypassing the normal antigen processing pathway. Unlike conventional antigens, which activate a small, ________ __________ __________ _______ _______.
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