Scientists have developed a technique that, when combined with in vitro fertilization, could prevent certain hereditary diseases from being passed from mother to child. In experiments on rhesus monkeys(アカゲザル), genetic material was removed from an egg containing defective mitochondrial DNA and inserted into a healthy donor egg that had been stripped of its own genes but contained healthy mitochondria. The altered eggs were then fertilized and implanted in females. This procedure may one day allow women to have children that are biologically their own yet free from genetic diseases passed down through faulty mitochondrial DNA.