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Around 3—5 days after a sperm fertilizes an egg, the embryo takes the form of a blastocyst or ball of cells. Instead of transdifferentiation, the observed instances may involve fusion of a donor cell with a recipient cell. I have Parkinson's Disease. Scientists see many possible uses for stem cells. Adult stem cells can, however, be artificially reverted to a state where they behave like embryonic stem cells including the associated DNA repair mechanisms.

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