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NEWCASTLE-UPON-TYNE, England - Every year, about 500 women come to the Newcastle Fertility Center, an assisted reproduction clinic in the heart of this northern industrial British city.

They walk under a large, exuberant sign in primary colors that reads "Life" (the "f" in the shape of a chromosome), past a cafe called Twist (the "i" in the shape of a double helix), amid throngs of children parading to the nearby science museum, and then into the bright yellow Life Bioscience Center building.

Usually they come in hope of conceiving a child, but beginning recently, the patients have been offered an unusual option: the possibility of donating egg cells for the creation of cloned human embryos, which researchers here hope to use to isolate human embryonic stem cells. So far, the laboratory director says, most patients are willing.

In early August, the British government put Newcastle on the map of controversial world laboratories when the Human Fertilization and Embryology Authority, which oversees reproductive technology here, issued a license allowing scientists to pursue human cloning experiments. Although British law forbids use of...