frozen zoo
 n.— «During her eight years of service, she has advanced from washing lab slides to keeping the computerized inventory of what is sometimes called the “frozen zoo.” That includes thousands of animal sperm and unfertilized egg samples kept frozen in vials until they are used to help reproduce various endangered species» —“Volunteer gets a different look at animal world” by Jeff Frank in Escondido North County Times (California) Nov. 5, 2006. (source: Double-Tongued Dictionary)

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