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Is Cloning of Extinct Animals Possible?

It seems researchers are close to cloning the woolly mammoth and perhaps a species of frog that gives birth to offspring with its mouth - swallowing fertile eggs then incubating them in its mouth. The frog died out in 1983. We have heard claims like this before. Personally, I believe we are a long way from being able to do this.

Repairing the damage that pushed them to extinction is not sufficient to bring them back. Finding specimens with suitable preserved material is near impossible. Even the few frozen southern gastric-brooding frogs were not initially preserved with the intention of "cloning". Special techniques were not applied.

It is thought improved systems like somatic cell nuclear transfer will enable creation of a living frog. Some presume this can be used on viable mammoth cells. The issue will be producing a healthy living creature. Previous research has resulted in incomplete clones: many do not live long. Most scientists are pessimistic about the possibility of "perfect" cloning.
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Conservation
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