Scientists have successfully turned mouse skin cells into egg cells and used them to create viable offspring without the use of actual eggs for the first time.

Just a small percentage of the mouse cells created in the lab led to live births, researchers reported Monday in Nature, but the healthy pups that resulted from these sci-fi pregnancies provide hope that similar techniques might one day aid human reproduction.

In theory, techniques like these could even allow two biological men to co-parent a child without the use of an egg donor.

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