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  1. Limiting Damage: Fragile X symptoms modulated in mice

    Reducing activity of a gene in mice alleviates many of the symptoms of fragile X syndrome, a genetic defect that causes mental retardation in people.

    By Patrick Barry
  2. Earth

    Portrait of a Meltdown: Many factors led to 2007’s record low in Arctic sea ice

    A variety of climatological factors converged in a perfect storm that melted the Arctic Ocean's ice cover to a record low in 2007. It could be a harbinger of ice-poor summers for decades to come.

    By Sid Perkins

  3. New clue to Down syndrome, leukemia link

    One-fifth of people with Down syndrome who also have acute lymphocytic leukemia harbor a mutation in their JAK2 gene.