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Artificial embryo twinning is done by imitating the process that creates identical twins. An embryo is split up and each part is put in a petri dish to develop. They are then placed in a surrogate mother. The resulting clones are exact genetic copies of each other.
Somatic Cell Nuclear Transfer is a laboratory technique for creating a clonial embryo, using an egg cell, that has had it's nucleus removed, and a nucleus from a cell of a different animal. It can be used in embryonic stem cell research, or potentially, in regenerative medicine where it is sometimes referred to as "therapeutic cloning." It can also be used as the first step in the process of reproductive cloning.