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Stem cell transplants can be either auto (patient's own stored cells) or allo (related or unrelated donor.) According to the National Marrow Donor Registry, currently 3500 unrelated donor transplants are performed each year in the U.S. Auto transplants are at least twice as common but I didn't find a number for them.

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14y ago
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15y ago

How many embryos are killed each year for stem cell research in the US?

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12y ago

It depends on how old the embryo is. If the embryo is 1 day old then there are fewer than if the embryo is 5 days old.

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11y ago

200-350 cells

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Q: How many cells make up an embryo?
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