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      Knowledge is Power

      Scientific American November 1998

      Down Detection

      New blood and ultrasound tests for Down syndrome might reduce the need for amniocentesis

      • By Carol Ezzell on November 1, 1998

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      More in the November 1998 issue of Scientific American
      • Reviews and Commentaries: Three Material Witnesses
      • The Editors Recommend
      • Evolution and the Origins of Disease
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