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      Knowledge is Power

      Scientific American November 1996

      Sharks and the Origins of Vertebrate Immunity

      Sharks, which have existed for as many as 450 million years, offer glimpses of a distant period in the evolution of the immune system

      • By Gary W. Litman on November 1, 1996

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      More in the November 1996 issue of Scientific American
      • A Guide to Computer Dating
      • Can China Feed Itself?
      • Global Climatic Change on Mars
      View Full Contents
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