Scientists plan to drop the 14-day embryo rule limiting research on stem cells

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"Now, however, a key scientific body is ready to do away with the 14-day limit. The action would come at a time when scientists are making remarkable progress in growing embryonic cells and watching them develop. Researchers, for example, can now create embryo-like structures starting even from stem cells, and some hope to follow these synthetic embryo models well past the old two-week line."