A 20-year mouse cloning experiment looked unstoppable until hidden damage began to surface, exposing a biological limit scientists could not ignore.
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releasing eggs, which can potentially be fertilized by sperm producing female sex hormones, such as progesterone and estrogen providing an environment for a fertilized egg to develop during pregnancy ...
the battle continues on other fronts, including efforts to ban the drugs now used in most abortions and to redefine embryos as children.