Medicine

Where do embryonic stem cells come from?

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Embryonic stem cells are derived from a blastocyst (the blastula typical of placental mammals; see embryo ), which is very young embryo that contains 200 to 250 cells and is shaped like a hollow sphere.

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Get more facts and information about stem cells . Or, view the full encyclopedia entry from The Columbia Encyclopedia, Sixth Edition.

Similar questions: How many cells are in a very young embryo? What is a blastocyst? [ Hide these questions ]

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