Medical researchers believe that stem cells have the potential to be used to cure various diseases as well as replace organs and vital tissues in the body. Adult stem cells, undifferentiated cells that create the differentiated cells of the body, are already being used to treat over a hundred diseases and conditions. Many of the ethical issues that critics take with stem cells collected from blastocysts, which must be destroyed after harvesting, are thus circumvented with collection from full-grown adults. But adult stem cells also have many limitations, including being only present in minute qualities, possibly.
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