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| In a large pool of B lymphocytes, each is specific for one antigen.

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.

Antibodies

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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