Scientists have grown human cells inside pig embryos, a very early step toward the goal of growing livers and other human organs in animals to transplant into people.
The cells made up just a tiny part of each embryo, and the embryos were grown for only a few weeks, researchers reported Thursday.
Such human-animal research has raised ethical concerns. The U.S. government suspended taxpayer funding of experiments in 2015. The new work, done in California and Spain, was paid for by private foundations.
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