The world recently welcomed a pair of monkeys that were created using the same method used to clone Dolly the sheep.

In a study published Wednesday in Cell, researchers successfully produced two genetically identical, long-tailed crab-eating macaques. Zhong Zhong and Hua Hua were born eight and six weeks ago, respectively, at the Chinese Academy of Sciences Institute of Neuroscience in Shanghai. It’s a technical benchmark that could have future applications in clinical research.

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