Fate of a Fertilized Egg: Why Some Embryos Don't Implant In the study, researchers found that human embryos typically produce a chemical called trypsin, which signals the womb to prepare its lining for implantation. But in embryos with significant genetic abnormalities, this chemical signal was altered, and it produced a stress response in the womb that could make implantation unlikely, the researchers said. The researchers likened this process to an ...
Feb. 6, 2014 - LiveScience.com via Yahoo! News