Survival for some endangered species hinges on 'Frozen Zoo'

In this Friday, Jan. 2, 2015 photo, Barbara Durant, director of reproductive physiology at the San Diego Zoo Institute for Conservation Research, a.k.a. the Frozen Zoo, stands on the rail of a nitrogen-cooled stainless steel vat holding hundreds of vials of animal cells at the Beckman Center at the San Diego Zoo's Safari Park in Escondido, Calif. ESCONDIDO, CALIF.

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