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According to ScienceAlert (This article and its images were originally posted on ScienceAlert January 1, 2019 at 03:59AM.)
Researchers in 2018 achieved a new kind of chimeric first, producing sheep-human hybrid embryos that could one day represent the future of organ donation – by using body parts grown inside unnatural, engineered animals.
With that end goal in mind, scientists created the first interspecies sheep-human chimera in February, introducing human stem cells into sheep embryos, resulting in a hybrid creature that’s more than 99 percent sheep – but also a tiny, little bit like you and me.
Admittedly, the human portion of the embryos created in the experiment – before they were destroyed after 28 days – is exceedingly small, but the fact they existed at all is what generates considerable controversy in this field of research.
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