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Antigen-Presenting Cells

Antigen presentation

Antigen presentation

In the upper pathway; foreign protein or antigen (1) is taken up by an antigen-presenting cell (2). The antigen is processed and displayed on a MHC II molecule (3), which interacts with a T helper cell (4). In the lower pathway; whole foreign proteins are bound by membrane antibodies (5) and presented to B lymphocytes (6), which process (7) and present antigen on MHC II (8) to a previously activated T helper cell (10), spurring the production of antigen-specific antibodies (9).

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    "Antigen presentation."
    https://en.wikipedia.org/wiki/Antigen_presentation Wikipedia GNU FDL 1.2.

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