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Published online 17 April 2008 | Nature | doi:10.1038/news.2008.762

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Nanobacteria theory takes a hit

Tiny 'living' particles may just be lumps of limestone.

They look like tiny bacteria, have been implicated in several diseases and have even been hailed as a completely overlooked branch of the tree of life. But are 'nanobacteria' genuinely alive? New research suggests that the answer is probably no.

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