Scientists have, for the first time, successfully freed embryos of a piece of faulty DNA that causes deadly heart disease to run in families.
By James Gallagher /
It potentially opens the door to preventing 10,000 disorders that are passed down the generations. The US and South Korean team allowed the embryos to develop for five days before stopping the experiment. The study hints at the future of medicine, but also provokes deep questions about what is morally right.