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female mammal |
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| The theory that female mammals are born with a finite number of germ cells (oocytes) has been accepted as an unquestionable truth for over 50 years. A study in mice appears to overturn the long-held assumption that female mammals are born with all the eggs they'll ever have. In birth, this is an advantage for the survival of the species: If a female mammal is threatened by a predator when she's in labor, the release of adrenaline tends to stop the birth process, to give the mother the energy of fight or escape. |
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