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The technology may eventually make it possible to generate and bank human embryonic stem cells, which would be genetically identical to children born from the transferred IVF embryos. These stem cells could be used decades later for regenerative medicine.

Commenting on the Nature papers, Irving Weissman, a leading stem cell scientist at Stanford University, said: “Although the efforts cited here will be criticised as a diversion of good science by politics, I believe all of these attempts to advance and translate medical science should be pursued in parallel.”