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The mammalian immune system is broken down into the humoral and cell-mediated responses. The humoral response is activated by antibodies released from plasma cells which replicated from a B cell activated by a helper T cell. In the cell-mediated response, cytotoxic T cells, also activated by helper T cells, bind to an infected host cell and lyse it through releasing perforins which allow water and ions to rush into the cell.
Contributed by Plamen Kamenov