AdvertisementScientists Make Model Embryos From Stem Cells To Study Key Steps In Human DevelopmentJuly 01, 2019Rob SteinfacebookEmailUsing embryonic stem cells, researchers created a structure that mimics the earliest stages of human development in the womb. This image shows the structure breaking the symmetry of the sphere, which starts the development of more complex structures that eventually develop into a fetus. (Mijo Simunovic, Ph.D., Simons Junior Fellow, The Rockefeller University)