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Scientists are trying to get cows pregnant with synthetic embryos
Can animals be made without sperm or eggs? The answer could upend our ideas about what life is.
It was a cool morning at the beef teaching unit in Gainesville, Florida, and cow number #307 was bucking in her metal cradle as the arm of a student perched on a stool disappeared into her cervix. But last year Jiang, along with researchers in Texas, published a recipe for making a bovine version, which they called “cattle blastoids” for their resemblance to blastocysts, the stage of the embryo suitable for IVF procedures. To quell speculation, in June the International Society for Stem Cell Research, a powerful science and lobbying group, put out a statement declaring that the models “are not embryos” and “ cannot and will not develop to the equivalent of postnatal stage humans.”
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