The debate might eventually be a moot point, as researchers continue to make convincing headway with induced pluripotent cells, which seem to have all the properties of embryonic stem cells but which are created from adult cells. But both Mathews and Green acknowledge that creating a functional egg from skin or other cells still looks to be a long way off. “Generally the science moves pretty slowly and incrementally,” Mathews says. “It’s always difficult to predict, but if we could predict it, it wouldn’t be science.”
Note: This article was originally printed with the title, "Shelling Out for Eggs."