| In a large pool of B lymphocytes, each is specific for one antigen.
^ When an antigen binds to a B cell, the B cell divides.
Primary immune response
Clone of B cells
^ Some cells
^ Antibodies are specific for the antigen.
Secondary Memory M M
| .and gives rise to a clone of B cells, all specific for the same antigen.
This proliferation of lymphocytes is the primary immune response.
^ Some cells differentiate into antibody-secreting plasma cells.
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