Human Embryo

Controversial New Guidelines Would Allow Experiments On More Mature Human Embryos

For decades, scientists have been prohibited from keeping human embryos alive in their labs for more than 14 days. The prohibition was aimed at avoiding a thicket of ethical issues that would be raised by doing experiments on living human embryos as they continue to develop. But on Wednesday, an influential scientific society recommended scrapping that blanket taboo, known as the “14-day rule.”

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