Survival for some endangered species hinges on 'Frozen Zoo'

Whenever an endangered animal dies at the San Diego Zoo, researchers race out, regardless of the hour, to remove its sperm or eggs, maybe a bit of ear or eyeball, and carefully freeze the cells in liquid nitrogen. Today, the survival of the northern white rhinoceros and dozens of other species could hinge on the collection amassed over nearly 40 years that has become the largest gene bank of its kind: The Frozen Zoo.

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