The immune system has many different defence parts. One of the ways it gets ready is, having an antigen with a matching receptor as the Killer-T cell. When these 2 connect the multiply, creating a larger team. Here is a way that the good destroys the bad, the Killer-T cell connects with the enemy and sends harmful chemicals into it, and these neutralize it so it is dead. Anther way they multiply is by the antigens colliding with a Phagocyte and they produce more Killer-T cells or Memory cells. The memory cells stay and defend the second wave of the same invasion.
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