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    Egg-Producing Stem Cells Found in Human Ovaries

    Study Suggests Women May Be Able to Make More Eggs as They Age

    Still, It’s a Long Way to Mars continued...

    But when they took those cells and implanted them back into human ovarian tissue, they divided and essentially made young eggs.

    Tilly says his team stopped short of trying to make one of the eggs functional because “for a lot of reasons, as it should be,” it is illegal in the U.S. to experimentally fertilize human eggs.

    “We think the evidence provided clearly indicates that this very unique, newly discovered pool of cells does exist in women,” he says.

    A Lot of Potential

    “It’s a really exciting result,” says Evelyn Telfer, PhD, a cell biology expert at the University of Edinburgh in Scotland.

    “What we’ve previously believed is that you don’t get new eggs formed during your adult life. This discovery shows that there’s the potential for them to be formed, no question about that,” Telfer says, “but it doesn’t actually show that they’re being formed under normal conditions.”

    Indeed, she notes, experience would suggest otherwise. Women, after all, do lose their fertility as they age.

    “There are cells there that under certain conditions have the potential to form [eggs]. That’s the really exciting part of this work. And of course they can be used. There’s a practical application,” she says.

    Telfer has pioneered a technique that allows her to take immature human eggs and turn them into mature, fertilizable eggs outside the body. She has already partnered with Tilly to try to take his “seed” eggs to the next stage of development. With special government permission, she says, they may even be able to try to experimentally fertilize the eggs.

    “It’s actually opening up a whole new field of research, to define these cells, to characterize these cells, and to use them in a practical way,” she says.

    Tilly says that by using egg-generating stem cells to make large numbers of viable eggs, doctors might one day be able to cut the expense of in vitro fertilization (IVF), since women would no longer have to go through multiple cycles of treatment to harvest enough eggs to generate a pregnancy.

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