A human-pig hybrid embryo has been created in a world first
The 'chimera', or human-animal hybrid, was created by injecting human stem cells into pig embryos and then implanting them in a sow.
The human stem cells grew and formed part of the tissue of the pig embryos, although they did not become piglets as they were removed at 28 days.
The amount of human tissue that grew in the pig embryos was 'low', researchers said.
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