Commentary: Human Clones: It's Decision Time

The idea of cloning an adult human, a staple of science fiction that was once thought biologically impossible, has taken a great leap into the present. With the July 22 news that scientists had cloned 50 mice from adult mouse cells, we learned that the near magic which produced Dolly the sheep two years ago can be reduced to an almost humdrum process. "We can now sit down at a microscope and create a clone whenever we want," says Laith Reynolds, chief executive officer of ProBio America, the small Hawaiian company that owns the rights to the mouse-cloning method.

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