How Cloning Works

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Cell Specialization
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What is differentiation?

What did scientists learn about cell specialization?
   The process by which cells become specialized is called differentiation . Until recently, scientists had thought that once a cell had specialized, it could not be returned to the unspecialized state of an egg cell. But this is just what the researchers who produced Dolly were able to do. First they removed some cells from a six-year-old sheep. These cells happened to come from the sheep's udder .
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Last updated: August 18
, 2000.