In theory, the embryo could also be grown into a living human clone of the donor, but scientists said there was no intention and no reasonable argument for doing so.

He points out that a human clone, while man-made, would not provide a very interesting example.

Most researchers believe that in the foreseeable future it will not be possible to use the current cloning technique to produce a human clone that will develop to term.

Ethicists have speculated on difficulties that might arise in a world where human clones exist.