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Nature 404, 235-239 (16 March 2000) | doi:10.1038/35005194;
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Evolution: In search of the whales' sisters
The cetaceans — dolphins, porpoises and whales — are aquatic mammals that returned to the sea. A long-standing puzzle is which other mammals are their closest relatives, for molecular and morphological approaches to the question give conflicting answers. A study that includes analysis of ancient |[lsquo]|divergent|[rsquo]| fossil groups shows that such groups may contain much information to help resolve the puzzle.
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