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Nature 415, 572-574 (7 February 2002) | doi:10.1038/415572a

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All at sea

Jon Copley1

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The oceans are full of microorganisms, which are thought to cycle nutrients and mediate climate on a global scale. Despite these environmental consequences, marine microbial biodiversity remains poorly understood. Jon Copley reports.

When it comes to mind-boggling numbers, marine microbiologists can give anyone a run for their money. The oceans are brimming with more than 3 times 1028 bacteria — that's about 100 million times more cells than there are stars in the visible Universe.