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Biologist Ji Wu and his colleagues at Shanghai Jiao Tong University reported that they had isolated "female germline stem cells" from adult mouse ovaries. To prove their case, the team even genetically modified the putative stem cells so that they produced green fluorescent protein (GFP) and then injected them into the ovaries of sterilized mice. After the treatment, those females gave birth to pups that glowed green, demonstrating that the injected cells had given rise to mature oocytes.
Tilly holds a patent on the human egg stem cells, and he has started a biotech company to explore possible ways to use the cells to help improve fertility treatments.