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If replicated using human stem cells, the technique could produce a way of treating diabetic patients by providing a way of replacing their pancreas

In reality researchers are not allowed to create human embryos that lack the ability to grow organs and so they hope to do the same using pigs.

They have, however, already managed to produce pigs that were able to generate human blood by injecting blood stem cells from humans into pig foetuses. He said: "For ethical reasons we cannot make an organ deficient human embryo and use it for blastocyst complementation. "So to make use of this system to generate human organs, we must use this technique using blastocysts of livestock animals such as pigs instead

Blastocyst complementation across species had never been tested before, but we have now shown that it can work."