How lymphocytes recognise their own cells

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  • How lymphocytes recognise their own cells
    • There are probably around 10 million different lymphocytes, each capable of recognising a different chemical shape
      • In the fetus, these lymphocytes are constantly colliding with other cells
        • Infection in the fetus is rare because it is protected from the outside world by the mother and, in particular, the placenta
          • Lymphocytes will therefore collide almost exclusively with the bodys own material
            • Some of the lymphocytes will have receptors that exactly fit those of the body's own cells
              • These lymphocytes either die or are suppressed
                • The only remaining lymphocytes are those that fit foreign material and therefore only respond to foreign material


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