This is the basic principle of the immune system.

What this means is that a pathogen enters an organism. The pathogen has special protein markers called antigens which are recognised by our immune system. These antigens challenges the immune system to activate and produce new cells and stimulates the production of specially shaped proteins called antibodies. The immune system can produce many billions of different types of antibodies. However the immune system only produces small amounts of the B cells and T cells . . .

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