Pathogens invade body cells or are taken in by phagocytes, The phagocyte place antigens from the pathogen on its cell-surface membrane., Receptors on a specific t helper cell fit exactly onto these antigens, This attachement activates the T cell to divide rapidly by mitosis and form a clone of genetically identical cells, The cloned T cells develop into memory cells, stimulate phagocytosis, stimulate B cells and activate cytotoxic T cells..

Cell Mediated Immunity

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