The genetic material from the donor makes up less than 1% of the baby born by using the experimental IVF technique.

Scientists at Newcastle University used a new IVF technique that combines a mother’s egg and father’s sperm with a second egg from a donor woman in order to prevent a child from inheriting mitochondrial DNA disease from their mother.

In a groundbreaking UK first, eight healthy babies have been born using an IVF technique that includes DNA from three people—two parents and a female donor. The process, known as pronuclear transfer,