What circumstances make it difficult to obtain cloned animals by cell reconstruction?

The developed methods for animal cloning are far from perfect. In the process of experiments, a high mortality rate of fetuses and newborns is observed. Many theoretical questions of cloning animals from a single somatic cell are not yet clear.
Nevertheless, the success achieved in cloning sheep and monkeys showed the theoretical possibility of creating genetic copies of a person from a separate cell taken from any of his organs. Many scientists enthusiastically accepted the idea of human cloning.

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