Scientists said Thursday they had produced pig embryos that carry human cells in a new step toward making animals whose organs could be transplanted into people.
The embryos did not grow into part-human piglets and the technique was far from perfect, the researchers reported in the journal Cell. And these are not the first animals that are part human, part-animal.
But it's the first time this particular technique has been used to make chimeras — animals with parts from two different species.
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