The UK looks set to become the first country to allow the creation of babies using DNA from three people, after the government backed the IVF technique.
Experts say three-person IVF could eliminate debilitating and potentially fatal mitochondrial diseases that are passed on from mother to child.Opponents say it is unethical and could set the UK on a "slippery slope".They also argue that affected couples could adopt or use egg donors instead.
BBC News - UK government backs three-person IVF