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One kind of pathogen invades and passes the first line of defense in the immune system.
This kind of pathogen has a specific label (antigen).
This pathogen disguises itself from macrophages so that macrophages couldn't recognize them, therefore it passes the second line of defense, which is still innate.
As the pathogens get further, the adaptive immune system is stimulated by helper T cells signaling B cells and killer T cells.
The B cells come in and they have that antibodies that specifically bound to the antigen of that pathogen and chain them together.
The chained pathogens are disabled, and the macrophages pop in and digest them.
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