OvaPrime, the treatment created by scientists at OvaScience, would intervene with a woman's fertility long before an egg has matured. For decades scientists thought that a woman was born with all the eggs she would ever have, but in 2004, researchers discovered egg precursor cells--stem cells in the ovaries that become fertile eggs--in mice. The OvaPrime treatment removes a woman's egg precursor cells and places them in a different part of the ovary in which they can mature into healthy cells. And since stem cells are the youngest cells in the body, the Daily Beast article notes, they haven't been damaged by the biological changes that can cause eggs develop mutations and become less healthy. Doctors can then remove those healthy eggs and perform a typical IVF procedure, theoretically yielding a higher success rate.