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What now?

I like to think that when Medawar and his colleagues showed that immunological tolerance could be produced experimentally the new immunology was born. This is a science which to me has far greater potentialities both for practical use in medicine and for the better understanding of living process than the classical immunochemistry which it is incorporating and superseding.

Frank Macfarlane Burnet 'Immunological Recognition of Self', Nobel Lecture, 12 December 1960.