In the Media
How Long Should Human Embryos Be Allowed to Grow in a Dish?
The 14-day rule, which limits the growth of human embryos outside the human body to two weeks, has been largely hypothetical since it was adopted in the late 1970s. But research advances make continued embryonic growth “technically possible,” Hastings Center director of research Josephine Johnston tells Nature. Johnston was part of a national meeting that discussed whether and how the ethical boundary should be moved.