In the future, Mitalipov anticipates it will be possible to produce a stem cell line from each donated egg.

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Cells would be removed from someone with, say Parkinson's, and injected into a donated egg to create a cloned embryo.

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Although the toddler will not be able to conceive naturally, she could carry a child created from a donated egg.

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That process requires human egg cells, which must be donated by women.

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There is another benefit of egg-freezing technology that many people don't know about: If your own frozen eggs don't survive thawing or fertilization or fail to grow into robust embryos, you can go online to one of the many commercial egg banks popping up across the country and order a batch of frozen eggs donated by a woman who looks like you.

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Using IVF, a surrogate and donated eggs, a gay couple could mix and match their sperm with the desired characteristics of an egg donor, creating children with, say, the actual genes of one partner and the mimicked characteristics of the other.

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