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The immune system is a complex network of cells, tissues, and molecules that work together to defend the body against pathogens, foreign substances, and abnormal cells. Lymphocytes, including B cells and T cells, are central to adaptive immunity. B cells are responsible for humoral immunity by producing antibodies that specifically recognize and neutralize antigens, whereas T cells mediate cellular immunity, with _____ ___ ____ ____ ________ _________ ___ _____ ______ _________ ______ ___.
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