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Published online 4 January 2001 | Nature | doi:10.1038/news010104-5
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Poles apart, molars together
Mammals' complex teeth may have evolved twice, on either side of a great divide.
The teeth that might have allowed mammals to develop from their tiny shrew-like ancestors into today's relative giants arose twice on different continents. So a new study reported in Nature1 suggests, challenging previous ideas on how advanced mammals first came about more than 100 million years ago.
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