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Nature 456, xvii (18 December 2008) | doi:10.1038/7224xviia; Published online 17 December 2008

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Making the paper: Manolo Gouy

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Genomic clues settle debate about ancestor of all life forms.

At the root of the tree of life is a hypothetical organism from which all life on Earth today is descended. This 'last universal common ancestor', or LUCA, as it is known, arose at an unknown point in time, probably in the oceans more than 3.

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