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conversations now, while the research is still in a preliminary stage, while we can say pretty clearly that these structures, whatever they are, they do not rise to the level of full embryos and don t have the capacity to turn into human beings. and so lack that moral status and concern at the current time. so the time to really sort out where we draw those lines and what the oversight should look like is now while this research is still ongoing, but before it s across those boundaries, where you have to start to make really, really tough calls. such a fascinating but fraught topic. really appreciate your expertise on this, david magnus. thanks so much. no problem. coming up here on cnn musem newsroom, round three of the u.s. tournament golf tournament had many wincing during the 18th hole of the tournament. coy wire joins me to explain the up and down day for rickie fowler. here he is.
diseases or what causes miscarriages. the embryo-like structures are confined to test tubes. implanting them a womb would be illegal. for more on this, i m joined by david magnus, the director of the stanford center for biomedical ethics. thank you so much for being here with us. so researchers are generally not allowed to grow human embryos for more than 14 days. so from an ethical point of view, what s the difference between growing a human embryo and growing a human embryo model? yeah, so that s actually a tough question to answer. and in way, we don t really know the answer yet. scientists are trying to find ways of better understanding the process of development, and the current 14-day limits that are mostly self-imposed by the research community, although there are some regulations that impose those limits as well in some jurisdictions, make it hard to really fully study development. so there are these efforts to try to create these embryo-like