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    Handy Genetic Switch Helps You Grow Hands—or Paws, or Fins

    When an enormous four-finned fish surfaced in a South African fisherman’s catch in 1938, scientists were fascinated by its resemblance to fossilized creatures that had died out millions of years ago. The fish, called a coelacanth, turned out to be the first descendant of those organisms ever spotted by humans. The two living species identified […]