The development comes less than two years after the US government said it would approve funding of these controversial experiments, but later backtracked after receiving more than 20,000 complaints from animal rights groups.
Pablo Ross, associate professor of animal science at the University of California, Davis who is part of leading the venture, admitted he harbors similar concerns.
It depends on how far the human cells roam in the animal, he said. If they spread further than intended, it could be impossible to approve for ethical reasons.
But he insisted it is one of the most promising explorations in medicine right now.
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