Embryo made without sperm or eggs initiate pregnancy in mice
Netherlands-based researchers have created embryo-like structures in the lab from stem cells, without using eggs or sperm. The stem cells corresponding to the placenta and embryo created a proto-embryo that initiated pregnancies when implanted into mouse wombs. Researchers hope the study could explain why two-thirds of IVF treatments fail, mostly at the time of implantation in the uterus.