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Tigger71 Tigger71 36-40, F 1 Answer Jan 19, 2010

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To clone something, you need to be able to extract the nucleus from some of it's cells. Red blood cells have no nucleus, so you can't clone them. It is possible to clone undifferentiated blood cells, and then develop them into mature blood, but it would not be a very useful endeavor.<br />
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It is commonly said that Rh- blood can be given to Rh+ people without enacting an immune response, and this is true, in very small doses. It doesn't work any more if a large amount of blood is given though, because the donor blood has antibodies to the Rh factor in it, and eventually will react when they become too numerous. For this reason, in blood transfer procedures, as often as possible donor blood and it's recipient have the same type.<br />
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Because cloned blood has to start as undifferentiated blood cells, it ends up with white blood cells too. The b-cells in it would be making antibodies to the Rh factor, so you really wouldn't be able to give it to anyone who didn't match the type.

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