Scientists have created synthetic blobs that resemble a 14-day-old human embryo for the first time, meaning they can study embryo development beyond a particularly tricky period of pregnancy.Historically, international rules prevent research on human embryos more than 14 days after fertilization.But the new technique uses stem cells, which have the potential to transform into any other type of cell, such as a heart, skin or even brain cell, to mimic embryos.
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