Will stem cell 'zoos' save endangered species?

There are only seven northern white rhinos left in the world — but a new scientific breakthrough may rescue their kind from extinction

An endangered northern white rhino and its calf: Using stem cells, scientists are developing an artificial reproduction program that could help bring these animals back from the brink.
(Image credit: Nigel Pavitt/JAI/Corbis)

The northern white rhinoceros is one of the world's most endangered species — a mere seven beasts are alive today. But new research may offer the threatened rhinos a new hope. Scientists say they have produced the first stem cells from two different endangered species — the white rhino and a west African monkey called a "drill." These stem cells could be used to create sperm and eggs for artificial reproduction, and thus save the species from extinction. How would this work? Here's what you need to know:

How were the stem cells made?

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