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In the unfertilized egg, the substances are inactive and are not distributed homogeneously.
在未受精卵中，这些物质是不活跃的，而且分布不均匀。
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A female stores sperm and can determine the sex of each egg she lays by fertilizing it or leaving it unfertilized.
雌性储存精子，可以通过受精或不受精来决定每一个卵细胞的性别。
The scientists first removed the DNA from an unfertilized human egg, and then inserted a patient's mature skin cell containing the patient's DNA into that egg.
WSJ: Experiment Brings Human Cloning One Step Closer
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