Dr. Jun Wu's team at University of Texas Southwestern medical Center at Dallas have created hollow balls of cells that closely resemble embryos at the stage when they usually implant in the womb, which are known as blastocysts. The new laboratory-made embryos have been dubbed "blastoids." Credit: UT Southwestern Medical Center Scientists Create Living Entities In The Lab That Closely Resemble Human Embryos By at 9:01 am NPR For decades, science has been trying to unlock the mysteries of how a single cell becomes a fully formed human being and what goes wrong to cause genetic diseases, miscarriages and infertility. Now, scientists have created living entities in their labs that resemble human embryos; the results of two new experiments are the most complete such "model embryos" developed to date.