During the first phase of the immune response
induced by an antigen (e.g., a bacterium, virus,
fungus, or foreign protein), there is rapid proliferation
of B cells (humoral immune response).
The B cells mature to plasma cells,
which form free antibodies (immunoglobulins)
directed at the antigen. The antibodies bind
specifically to the antigens. The humoral immune
response is rapid, but it does not reach
foreign organisms that have invaded body cells.
They are the target of the cellular immune response.
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