The development of human embryos and early organ formation remain largely unexplored due to ethical issues related to the use of embryos...Human embryo development and early organ formation remain largely unexplored due to ethical issues related to the use of embryos for research, as well as the limited availability of materials to study. Now, a team of researchers from China has managed to create embryo-like structures from monkey embryonic stem cells. The researchers also transferred these embryo-like structures into the wombs of f