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embryos

Artist's rendition of a family of pterosaurs, which had massive wingspans of up to 13 feet and likely ate fish with their large teeth-filled jaws. Illustrated by Zhao Chuang hide caption

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Illustrated by Zhao Chuang

A surgical team at Sooam Biotech in Seoul, South Korea, injects cloned embryos into the uterus of an anesthetized dog. Rob Stein/NPR hide caption

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Rob Stein/NPR

Disgraced Scientist Clones Dogs, And Critics Question His Intent

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Frozen sperm straws and embryos are stored in liquid nitrogen, in a process known as cryopreservation. One question confronting the courts: Should embryos such as these be treated as property, or as children subject to custody action? Veronique Burger/Science Source hide caption

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Veronique Burger/Science Source

After A Divorce, What Happens To A Couple's Frozen Embryos?

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