Scientists say they have, for the first time, cloned human embryos capable of producing embryonic stem cells.
The accomplishment is a long-sought step toward harnessing the potential power of embryonic stem cells to treat many human diseases. But the work also raises a host of ethical concerns.
“This is a huge scientific advance,” said Dr. George Daley, a Harvard stem cell scientist who wasn’t involved in the work. “But it’s going to, I think, raise the specter of controversy again.”
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