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Nature 421, 122-124 (9 January 2003) | doi:10.1038/421122a

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Molecular systematics: Counting angels with DNA

Mark Blaxter

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It is impossible to describe biological diversity with traditional approaches. Molecular methods are the way forward — especially, perhaps, in the form of DNA barcodes.

For 200 years taxonomists have recognized two living species of elephant, the African and the Indian. According to molecular evidence, however, this understanding is wrong1, 2.