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Nature 438, 8-9 (3 November 2005) | doi:10.1038/438008b; Published online 2 November 2005

Protists push animals aside in rule revamp

Tom Simonite

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Redefined kingdoms give centre stage to single-celled organisms.

Organisms whose cells have a nucleus — eukaryotes — have traditionally been separated into four 'kingdoms'; now they have been reorganized into six. The authors of the revision hope that it will bring peace to a long-divided discipline, and raise awareness of the diversity of single-celled organisms.