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    Biology A-Level

    probability of a lymphocyte meeting its antigen

    What probability of a lymphocyte meeting its antigen means in Biology A-Level, as defined for AQA.

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    Increased by presentation, because each T cell recognises only one antigen, cells carrying that receptor are rare, and free antigen in lymph is easily missed.
    AQA · Cell recognition and the immune system (study guide)

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