Attempts to find out why this occurs have been hampered by political constraints on human embryo research in the United States. (discovermagazine.com)
«Everything we talked about was about research directly on the embryo,» for example, to improve on infertility treatment or better understand cancer biology, says R. Alta Charo, a law professor and bioethicist at the University of Wisconsin Law School who was a member of the NIH Human Embryo Research Panel in the mid-1990s, which considered how embryos might be used in research. (sciencemag.org)
In 1994, the law forbids strictly human embryo research in France. (istem.eu)