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Scientists Find Worms that Recently Evolved the Ability to Regrow a Complete Head

An international group of researchers including biologists from the University of Maryland found that at least four species of marine ribbon worms independently evolved the ability to regrow a head after amputation. 

“This means that when we compare animal groups we cannot assume that similarities in their ability to regenerate are old and reflect shared ancestry,” said Alexandra Bely, associate professor of biology at UMD and one of the study’s authors. “We need to be more careful when comparing regeneration findings across different groups of animals.”….[  ]

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