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Nature Medicine 15, 495 (2009)
doi:10.1038/nm0509-495

Follicle of youth

Adult and neonatal mouse ovaries contain a population of cells that, after passage in culture, can give rise to viable oocytes. With this finding, Kang Zou et al.1 wade into the long-running controversy over whether adult mammals can produce new oocytes, or whether their number is fixed by birth.