In a study of early embryonic development in primates, an international research team under the leadership of Berthold ...

However, to create ES cell lines, it is necessary to destroy preimplantation embryos at the blastocyst stage of 100–200 cells. Many people believe that life begins at conception and that ...

This mechanism to temporarily slow development, called embryonic diapause, often happens at the blastocyst stage, just before the embryo implants in the uterus. During diapause, the embryo remains ...