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Scientists in the United States have injected human stem cells into pig embryos to produce human-pig embryos known as chimeras
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"Scientists in the United States are trying to grow human organs inside pigs.
They have injected human stem cells into pig embryos to produce human-pig embryos known as chimeras.
The embryos are part of research aimed at overcoming the worldwide shortage of transplant organs.
The team from University of California, Davis says they should look and behave like normal pigs except that one organ will be composed of human cells.
But the work is controversial. Last year, the main US medical research agency, the National Institutes of Health, imposed a moratorium on funding such experiments.
The main concern is that the human cells might migrate to the developing pig's brain and make it, in some way, more human.
Pablo Ross says this is unlikely but is a key reason why the research is proceeding with such caution: "We think there is very low potential for a human brain to grow, but this is something we will be investigating."
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