Scientists Make Human Embryo Clones

Scientists in California say they have produced embryos that are clones of two men, a potential step toward developing scientifically valuable stem cells.

The new report documents embryos made with ordinary skin cells. But it's not the first time human cloned embryos have been made. In 2005, for example, scientists in Britain reported using embryonic stem cells to produce a cloned embryo. It matured enough to produce stem cells, but none were extracted.

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