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Researchers were able to inject human stem cells into pig embryos and implant the embryo into a sow where they were able to grow for 28 days.
http://www.bbc.com/news/health-38717930
Political angles:
Is this "playing god"
What amount of human cells constitutes human life and should they be allowed to grow?
Embryos that are less than 0.001% human - and the rest pig - have been made and analysed by scientists.
It is the first proof chimeras - named after the mythical lion-goat-serpent monster - can be made by combining material from humans and animals.
However, the scientific report in the journal Cell shows the process is challenging and the aim of growing human organs in animals is distant.
It was described as an "exciting publication" by other researchers.
To create a chimera, human stem cells - the type that can develop into any tissue - are injected into a pig embryo.
The embryo - now a mix of human and pig - is then implanted into a sow for up to one month.
The process appears very inefficient - of the 2,075 embryos implanted only 186 continued to develop up to the 28-day stage.
But crucially there were signs that human cells were functioning - albeit as a tiny fraction of the total tissue - as part of a human-pig chimera.
http://www.bbc.com/news/health-38717930
Political angles:
Is this "playing god"
What amount of human cells constitutes human life and should they be allowed to grow?