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Human cloning

Human cloning is the creation of a genetically identical copy of an existing, or previously existing, human being or growing cloned tissue from that individual.

The term is generally used to refer to artificial human cloning; human clones in the form of identical twins are commonplace, with their cloning occurring during the natural process of reproduction.

Although genes are recognized as influencing behavior and cognition, "genetically identical" does not mean altogether identical; almost no one would deny that identical twins, despite being natural human clones with identical DNA, are separate people, with separate experiences and not altogether overlapping personalities.

However undramatic it may sound, the relationship between an "original" and a clone is rather like that between identical twins raised apart; they share all the same DNA, but little of the same environment.

Note:   The above text is excerpted from the Wikipedia article "Human cloning", which has been released under the GNU Free Documentation License.
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