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Published online 11 August 2008 | Nature | doi:10.1038/news.2008.1027

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Pulling DNA from sharks' teeth

Method tracks genetic changes in endangered animals.

A technique that can analyse DNA from sharks' teeth is helping conservation biologists to study endangered species of the poorly understood fish.

Until now scientists have not been able to extract DNA from old shark samples, as the fish do not have the bony skeletons that are essential for conventional methods.

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